• A new elasmobranch Karksiodus mirus gen. et sp. nov. from the Burtnieki Regional Stage, Middle Devonian of EstoniaIvanov, Alexander; Märss, Tiiu; Kleesment, Anne-LiisEstonian journal of earth sciences2011 / 1, p. 22-30 : ill https://artiklid.elnet.ee/record=b2284327*est
• A strange case of two fishes: enigmatic disappearance of bone tissue or an originally unossified osteostracanTinn, Oive; Lang, Liisa; Märss, Tiiu; Kirsimäe, KalleThe Fossil Week : abstract book : 5th International Palaeontological Congress: IPC5 2018 : Paris, 9th-13th July, 20182018 / p. 858 https://ipc5.sciencesconf.org/data/IPC5_Abstract_Book.pdf
• A unique Late Silurian Thelodus squamation from Saaremaa (Estonia) and its ontogenetic developmentMärss, TiiuEstonian journal of earth sciences2011 / 3, p. 137-146 : ill https://artiklid.elnet.ee/record=b2424660*est
• "Agnatha" II : thelodontiMärss, Tiiu; Turner, Susan; Karatajute-Talimaa, Valentina2007 https://www.ester.ee/record=b2403830*est
• Anatomy of the Silurian thelodont Phlebolepis elegans PanderWilson, Mark V.H.; Märss, TiiuEstonian journal of earth sciences2012 / p. 261-276 : ill https://artiklid.elnet.ee/record=b2552040*est
• A bio- and chemostratigraphic search for the Mid-Ludfordian Carbon Isotope Excursion interval in the Ludlow of the Ohesaare core, EstoniaKaljo, Dimitri; Martma, Tõnu; Märss, Tiiu; Nestor, Viiu-Kai; Viira, ViiveEstonian journal of earth sciences2022 / p. 44-60 : ill https://doi.org/10.3176/earth.2022.04 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85126703493&origin=inward&txGid=eeeaac8c15bd01070f84725c3fb89b03 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000766812400002
• A bio-chemostratigraphical test of the synchroneity of biozones in the upper Silurian of Estonia and Latvia with some implications for practical stratigraphyKaljo, Dimitri; Einasto, Rein; Martma, Tõnu; Märss, Tiiu; Nestor, Viiu-Kai; Viira, ViiveEstonian journal of earth sciences2015 / p. 267-283 : ill https://artiklid.elnet.ee/record=b2750825*est https://doi.org/10.3176/earth.2015.33 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-84948743185&origin=inward&txGid=e05ae3704e98dc49c63f83c6d3f60673 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2015 https://www.webofscience.com/wos/woscc/full-record/WOS:000368359700002
• Biodiversity of the Silurian osteostracans of the East BalticMärss, Tiiu; Afanassieva, Olga; Blom, HenningEarth and environmental science transactions of the Royal Society of Edinburgh2014 / p. 73-148 : ill https://doi.org/10.1017/S1755691014000218 https://www.scopus.com/sourceid/11400153329 https://www.scopus.com/record/display.uri?eid=2-s2.0-84949922228&origin=inward&txGid=3abf2236860af2cfbca5108431e7a7eb https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EARTH%20ENV%20SCI%20T%20R%20SO&year=2014 https://www.webofscience.com/wos/woscc/full-record/WOS:000351442800001
• Chemical weathering east and west of the emerging Caledonides in the Silurian – Early Devonian, with implications for climateKiipli, Enli; Kiipli, Tarmo; Kallaste, Toivo; Märss, TiiuCanadian journal of earth sciences2016 / p. 774-780 : ill https://doi.org/10.1139/cjes-2015-0156 https://www.scopus.com/sourceid/22031 https://www.scopus.com/record/display.uri?eid=2-s2.0-84979920474&origin=inward&txGid=c6a593240e8ec69fa3b66f16942bf36f https://jcr.clarivate.com/jcr-jp/journal-profile?journal=CAN%20J%20EARTH%20SCI&year=2016 https://www.webofscience.com/wos/woscc/full-record/WOS:000380910300004
• A comparative SEM study of ossicles in the Pleuronectiformes (Teleostei) of the Baltic SeaMärss, Tiiu; Wilson, Mark; Lees, Janek; Saat, Toomas; Špilev, HeliProceedings of the Estonian Academy of Sciences2015 / p. 495-517 : ill https://doi.org/10.3176/proc.2015.4.05 https://www.scopus.com/sourceid/11500153303 https://www.scopus.com/record/display.uri?eid=2-s2.0-84955131930&origin=inward&txGid=12d65d546c5679b0567b3cc26d873de8 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=P%20EST%20ACAD%20SCI&year=2015 https://www.webofscience.com/wos/woscc/full-record/WOS:000366503800005
• A demineralized osteostracan fossil from the Silurian Kalana Lagerstätte of Estonia : revealing its internal anatomy and uncovering a unique type of fossilizationTinn, Oive; Lang, Liisa; Märss, Tiiu; Vahur, Signe; Kirsimäe, KalleLethaia2022 / 13 p. : ill https://doi.org/10.1111/let.12452 https://www.scopus.com/sourceid/13956 https://www.scopus.com/record/display.uri?eid=2-s2.0-85116741215&origin=inward&txGid=d161bbf87a76482a69879e26b9a79385 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=LETHAIA&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000705646100001
• Development of cyclic shedding teeth from semi-shedding teeth : the inner dental arcade of the stem osteichthyan LophosteusChen, Donglei; Blom, Henning; Sanchez, Sophie; Tafforeau, Paul; Märss, Tiiu; Ahlberg, Per E.Royal Society open science2017 / art. 161084 : ill http://dx.doi.org/10.1098/rsos.161084
• Eesti Devoni ja selle mikrofossiilide uurimine uue aastatuhande algulKleesment, Anne-Liis; Märss, Tiiu; Niit, MoonikaEesti geoloogide neljas ülemaailmne kokkutulek "Eesti geoloogia uue sajandi künnisel" : konverentsi materjalid ja ekskursioonijuht = The Fourth World Meeting of Estonian Geologists "Estonian Geology in the Beginning of the New Century : conference materials and excursion guide2003 / lk. 31-33
• Eestit tuntakse Siluri kalade ja nende uurija järgi : [intervjuu Tiiu Märssiga]Märss, Tiiu; Kukk, ToomasEesti Loodus2005 / 4, lk. 34-37 : fot https://artiklid.elnet.ee/record=b2346648*est
• Endolymphatic structures in headshields of the osteostracan genus Tremataspis (Agnatha) from the Silurian of EstoniaMärss, Tiiu; Wilson, Mark V.H.; Viljus, MartEstonian journal of earth sciences2022 / p. 135-156 : ill https://doi.org/10.3176/earth.2022.10 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85138726425&origin=inward&txGid=6d8eaf574483b96c6f9d3376992cbfee https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000849800900002
• Excursion C: Silurian of Saaremaa Island : [20-22 May 2008]Männik, Peep; Hints, Olle; Kaljo, Dimitri; Nestor, Heldur; Märss, Tiiu; Viira, ViiveThe Seventh Baltic Stratigraphical Conference : 17-18 May 2008, Tallinn, Estonia : abstracts & field guide2008 / p. 111-137 : ill
• Exploring the three-dimensional vasculature of dermal hard tissues in thyestiid osteostracans using synchrotron radiation microtomographyBremer, Oskar; Qu, Qingming; Sanchez, Sophie; Märss, Tiiu; Fernandez, Vincent; Blom, HenningJournal of Vertebrate Paleontology2022 / art. e2196318 https://doi.org/10.1080/02724634.2023.2196318 https://www.scopus.com/sourceid/13941 https://www.scopus.com/record/display.uri?eid=2-s2.0-85159231923&origin=inward&txGid=5dffce4a4f33cf4469eb0d1c748f01b9 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=J%20VERTEBR%20PALEONTOL&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000986312700001
• Karksilepis parva gen. et sp. nov. (Chondrichthyes) from the Burtnieki Regional Stage, Middle Devonian of EstoniaMärss, Tiiu; Kleesment, Anne-Liis; Niit, MoonikaEstonian journal of earth sciences2008 / p. 219-230 : ill https://artiklid.elnet.ee/record=b1076710*est
• Keskpaleosoiliste selgroogsete evolutsioon ja levik põhjapoolkera meredes ning nende praktiline väärtus geoloogias : kommentaar Eesti Vabariigiteaduse aastapreemia pälvinud tööde tsüklileMärss, TiiuTallinna Tehnikaülikooli aastaraamat 20052006 / lk. 285-289 : ill
• Late Silurian tessellated heterostracans from the East Baltic and North TimanKaratajute-Talimaa, Valentina; Märss, TiiuThe Seventh Baltic Stratigraphical Conference : 17-18 May 2008, Tallinn, Estonia : abstracts & field guide2008 / p. 32
• Late Silurian-Early Devonian tessellated heterostracan Oniscolepis Pander, 1856 from the East Baltic and North TimanMärss, Tiiu; Karatajute-Talimaa, ValentinaEstonian journal of earth sciences2009 / 1, p. 43-62 : ill https://artiklid.elnet.ee/record=b1205601*est
• 'Natural experiments' reveal patterning logic of the dental development in the most primitive osteichthyan LophosteusChen, Donglei; Blom, Henning; Sanchez, Sophie; Tafforeau, Paul; Märss, Tiiu; Ahlberg, Per E.16th International Symposium on Early and Lower Vertebrates - Honoring Tiiu Märss & Philippe Janvier : conference programme and abstracts : Valencia, Spain, 20222022 / p. 21 http://iselv.uv.es/wp-content/uploads/2022/06/Abstract-Book-16ISELV_web.pdf
• Neotypes for some upper Silurian acanthodian taxa from the Baltic Sea Region and the Welsh BorderlandBurrow, Carole J.; Märss, TiiuEstonian journal of earth sciences2022 / p. 17-24 https://doi.org/10.3176/earth.2022.02 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85124341870&origin=inward&txGid=5e5f220840b1c4df6fbcb1bf7dc2a1fb https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000745819900002
• New data on karksiodus (chondrichthyes) from the main devonian field (East European platform)Ivanov, Alexander; Märss, TiiuEstonian journal of earth sciences2014 / p. 156-165 : ill https://doi.org/10.3176/earth.2014.14 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-84906955103&origin=inward&txGid=f62f1ec3af2479762b8dfdf376c944a9 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2014 https://www.webofscience.com/wos/woscc/full-record/WOS:000342880400003
• New data on the exoskeleton of the osteostracan genus Aestiaspis (Agnatha) from the Silurian of Saaremaa Island (Estonia) and the Severnaya Zemlya Archipelago (Russia)Afanassieva, Olga; Märss, TiiuPaleontological Journal2014 / p. 74-78 : ill https://doi.org/10.1134/S003103011401002X https://www.scopus.com/sourceid/14022 https://www.scopus.com/record/display.uri?eid=2-s2.0-84896365229&origin=inward&txGid=f2134e9634b945bbe951c94904a6d70e https://jcr.clarivate.com/jcr-jp/journal-profile?journal=PALEONTOL%20J%2B&year=2014 https://www.webofscience.com/wos/woscc/full-record/WOS:000333059500010
• Ohesaare cliffMärss, TiiuXI Baltic Stratigraphical Conference : abstracts and field guide2025 / p. 133-137 : ill https://www.ester.ee/record=b5696260*est https://files.geocollections.info/da9b19e5-2105-42be-a34c-2bd0136bdfa2.pdf
• On the erroneous identification of a turiniid thelodont in the Middle/Upper Devonian boundary beds of the Middle UralsMärss, Tiiu; Ivanov, AlexanderActa Geologica Polonica2018 / p. 455 https://geojournals.pgi.gov.pl/agp/article/view/26057 https://www.scopus.com/sourceid/24523 https://www.scopus.com/record/display.uri?eid=2-s2.0-85054574593&origin=inward&txGid=ea58fe7cfc325e9bfca7759d63d024d2 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=ACTA%20GEOL%20POL&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000454048600012
• Palaeoenvironmental signatures revealed from rare earth element (REE) compositions of vertebrate microremains of the Vesiku Bone Bed (Homerian, Wenlock), Saaremaa Island, EstoniaFadel, Alexandre; Žigaitė, Živilė; Blom, Henning; Pérez-Huerta, Alberto; Jeffries, Teresa; Märss, Tiiu; Ahlberga, Per ErikEstonian Journal of Earth Sciences2015 / p. 36 - 41 https://doi.org/10.3176/earth.2015.07 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-84924584536&origin=inward&txGid=a6acc11da8843caaea3ecc91a886c17f https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2015 https://www.webofscience.com/wos/woscc/full-record/WOS:000351327700008
• Rare earth elements (REEs) in vertebrate microremains from the upper Pridoli Ohesaare beds of Saaremaa Island, Estonia : geochemical clues to palaeoenvironmentŽigaite, Živile; Fadel, Alexandre; Märss, TiiuEstonian journal of earth sciences2015 / p. 115-120 : ill https://artiklid.elnet.ee/record=b2715987*est https://doi.org/10.3176/earth.2015.21 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-84924588132&origin=inward&txGid=2f077e5416251d216a3e5e1acb5db66a https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2015 https://www.webofscience.com/wos/woscc/full-record/WOS:000351327700022
• Revision of Silurian vertebrate biozones and their correlation with the conodont successionMärss, Tiiu; Männik, PeepEstonian journal of earth sciences2013 / p. 181-204 : ill https://artiklid.elnet.ee/record=b2651564*est https://doi.org/10.3176/earth.2013.15 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-84887854151&origin=resultslist&sort=plf-f&src=s&sot=b&sdt=b&s=DOI%2810.3176%2Fearth.2013.15%29 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2013 https://www.webofscience.com/wos/woscc/full-record/WOS:000327822600001
• Revision of thelodonts, acanthodians, conodonts, and the depositional environments in the Burgen outlier (Ludlow, Silurian) of Gotland, SwedenJarochowska, Emilia; Bremer, Oskar; Yiu, Alexandra; Märss, Tiiu; Blom, Henning; Mörs, Thomas; Vajda, ViviGFF2021 / p. 168-189 : ill https://doi.org/10.1080/11035897.2021.1907441 https://www.scopus.com/sourceid/25844 https://www.scopus.com/record/display.uri?eid=2-s2.0-85111620245&origin=inward&txGid=1a18a7f0492c93daba23774840f8a32c https://jcr.clarivate.com/jcr-jp/journal-profile?journal=GFF&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000675759300001
• Saaremaa pangadMärss, Tiiu; Soesoo, Alvar; Nestor, Heldur2006 https://www.ester.ee/record=b2238100*est
• Saarenmaan kalliotörmat2007 https://www.ester.ee/record=b2270667*est
• Siluri selgroogsed - ühe rühma arenguluguMärss, TiiuTeadusmõte Eestis (VI). Elu- ja maateadused : [artiklikogumik]2011 / lk. 117-124 : ill
• Silurian cliffs on Saaremaa Island2007 https://www.ester.ee/record=b2303172*est
• Silurian cyathaspidid heterostracans of Northern EurasiaMärss, TiiuEstonian journal of earth sciences2019 / p. 113–146 : ill https://doi.org/10.3176/earth.2019.11 https://www.ester.ee/record=b2246661*est https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85073367429&origin=inward&txGid=e5a770eaf01e2482af9025f2ef871a1c https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000490567900001
• Silurian cyathaspidid heterostracans of the Baltica and Kara terranesMärss, Tiiu14th International Symposium on Early and Lower Vertebrates : Checiny, Poland, 3-8.07.2017 : conference abstracts and field-trip guidebook2017 / p. 59
• Silurian vertebrate remains from the Oslo Region, Norway, and their implications for regional biostratigraphyBremer, Oskar; Turner, Susan; Märss, Tiiu; Blom, HenningNorwegian Journal of Geology2019 / p. 129 - 155 : ill https://doi.org/10.17850/njg99-1-07 https://www.scopus.com/sourceid/21101073720 https://www.scopus.com/record/display.uri?eid=2-s2.0-85123843975&origin=resultslist&sort=plf-f&src=s&sid=d0e9fa04099f5516818b1a19794a55a2&sot=b&sdt=b&s=DOI%2810.17850%2Fnjg99-1-07%29&sl=32&sessionSearchId=d0e9fa04099f5516818b1a19794a55a2&relpos=0 https://www.webofscience.com/wos/woscc/full-record/WOS:000509783400007
• Species-specific morphology of the endolymphatic openings in the headshields of the osteostracan genus Tremataspis (Agnatha), from the Silurian of EstoniaMärss, Tiiu; Wilson, Mark V.H.; Viljus, Mart16th International Symposium on Early and Lower Vertebrates - Honoring Tiiu Märss & Philippe Janvier : Conference programme and abstracts : Valencia, Spain, 20222022 / p. 6 http://iselv.uv.es/wp-content/uploads/2022/06/Abstract-Book-16ISELV_web.pdf
• The developmental relationship between teeth and dermal odontodes in the most primitive bony fish LophosteusChen, Donglei; Blom, Henning; Sanchez, Sophie; Tafforeau, Paul; Märss, Tiiu; Ahlberg, Per E.eLife2020 / art. e60985, 20 p. : ill https://doi.org/10.7554/eLife.60985.sa2
• The earliest osteostracan Kalanaspis delectabilis gen. et sp. nov. from the mid-Aeronian (mid-Llandovery, lower Silurian) of EstoniaTinn, Oive; Märss, TiiuJournal of vertebrate paleontology2018 / art. e1425212, 8 p. : ill https://doi.org/10.1080/02724634.2017.1425212 https://www.scopus.com/sourceid/13941 https://www.scopus.com/record/display.uri?eid=2-s2.0-85044173972&origin=inward&txGid=ecdcf703f8f098247074ad9c61ae6ac2 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=J%20VERTEBR%20PALEONTOL&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000429331600010
• The emergence of a complex pore-canal system in the dermal skeleton of Tremataspis (Osteostraci)Bremer, Oskar; Qu, Qingming; Sanchez, Sophie; Märss, Tiiu; Fernandez, Vincent; Blom, HenningJournal of Morphology2021 / p. 1141-1157 https://doi.org/10.1002/jmor.21359 https://www.scopus.com/sourceid/29629 https://www.scopus.com/record/display.uri?eid=2-s2.0-85104388918&origin=inward&txGid=b4bbf2836d634b12e0305a3f8397a290 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=J%20MORPHOL&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000646777300001
• The histology of osteostracan hard tissue revisited using synchrotron radiation microtomographyBremer, Oskar; Blom, Henning; Qu, Q.; Sanchez, Sophie; Märss, Tiiu15th International Symposium on Early and Lower Vertebrates, Qujing, Yunnan, China, August 8-13, 2019 : Conference programme and abstracts2019 / p. 10-11
• The interrelationships and evolutionary history of anaspidsBlom, Henning; Märss, TiiuMorphology, phylogeny and paleobiogeography of fossil fishes2010 / p. 45-56 : ill https://kirjandus.geoloogia.info/reference/1577
• The Middle Devonian acanthodian assemblage of the Karksi outcrop in EstoniaPinakhina, Darya; Märss, TiiuEstonian journal of earth sciences2018 / p. 96-111 : ill https://doi.org/10.3176/earth.2018.07 http://www.ester.ee/record=b2246661*est https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85042112969&origin=inward&txGid=d7c42d3e7d11ad813b141121f922195f https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000434109800001
• The morphology and sculpture of ossicles in the Cottidae (Teleostei) of the Baltic SeaMärss, Tiiu; Lees, Janek; Wilson, Mark V.H.; Saat, Toomas; Špilev, HeliEstonian journal of earth sciences2010 / 3, p. 216-237 : ill https://artiklid.elnet.ee/record=b2163755*est
• The morphology and sculpture of ossicles in the Cyclopteridae and Liparidae (Teleostei) of the Baltic SeaMärss, Tiiu; Lees, Janek; Wilson, Mark; Saat, Toomas; Špilev, HeliEstonian journal of earth sciences2010 / p. 263-276 : ill https://artiklid.elnet.ee/record=b2183599*est
• Thelodont Oeselia mosaica gen. et sp. nov. from the Wenlock and Ludlow of the East BalticMärss, TiiuProceedings of the Estonian Academy of Sciences. Geology2005 / 3, p. 181-190 : ill https://artiklid.elnet.ee/record=b2348695*est
• Thelodont phylogeny revisited, with inclusion of key scale-based taxaWilson, Mark V.H.; Märss, TiiuEstonian journal of earth sciences2009 / 4, p. 297-310 : ill https://artiklid.elnet.ee/record=b1944242*est
• Thelodonts (Agnatha) from the basal beds of the Kuressaare Stage, Ludlow, Upper Silurian of EstoniaMärss, TiiuProceedings of the Estonian Academy of Sciences. Geology2006 / 1, p. 43-66 : ill
• Vertebrate remains and conodonts in the upper Silurian Hamra and Sundre formations of Gotland, SwedenBremer, Oskar; Jarochowska, Emilia; Märss, TiiuGFF2020 / p. 52-80 : ill https://doi.org/10.1080/11035897.2019.1655790 https://www.scopus.com/sourceid/25844 https://www.scopus.com/record/display.uri?eid=2-s2.0-85073952902&origin=inward&txGid=ac075853bdc779c8649a176aea5a1193 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=GFF&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000487906900001
• Ühe väljasurnud kala lugu SaaremaaltMärss, TiiuLoodusesõber2011 / 3, lk. 20-23 : ill