• Air permeability properties of cross laminated timberLuciani, Giovanni; Horta, R.; Kallakas, Heikko; Kers, JaanProceedings of the 12th Meeting of the Northern European Network for Wood Science and Engineering (WSE) : Wood Science and Engineering - a Key Factor on the Transition to Bioeconomy : September 12-13, 2016, Riga, Latvia2016 / p. 80 http://www.kki.lv/dokumenti/WSE2016.pdf
• Assessment of fire-retardant treatments and their impact on the fire performance and bonding properties of aspen and silver birch veneersAlao, Percy Festus; Olusoji, Adekunle; Kallakas, Heikko; Just, Alar; Kers, JaanEuropean journal of wood and wood products2025 / art. 66 https://doi.org/10.1007/s00107-025-02223-1
• Development of hemp hurd particleboards from formaldehyde-free resinsAlao, Percy Festus; Tobias, Micah Onyedikachi; Kallakas, Heikko; Poltimäe, Triinu; Kers, Jaan; Goljandin, DmitriAgronomy research2020 / p. 679–688 : ill https://doi.org/10.15159/AR.20.127 https://www.scopus.com/sourceid/21100201050 https://www.scopus.com/record/display.uri?eid=2-s2.0-85086333855&origin=inward&txGid=1b539c72415f070dc2a89c7f1b2d5232
• Development of hemp hurd particleboards from formaldehyde-free resinsAlao, Percy Festus; Tobias, Micah Onyedikachi; Kallakas, Heikko; Poltimäe, Triinu; Kers, Jaan; Goljandin, Dmitri11th International Conference Biosystems Engineering : May 6-8, 2020 in Tartu, Estonia : book of abstracts [Võrguteavik]2020 / p. 99 https://www.ester.ee/record=b5347289*est
• Durability of wood plastic composites : influence of weathering on the mechanical propertiesKallakas, Heikko; Poltimäe, Triinu; Süld, Tiia-Maaja; Kers, JaanProceedings of The Northern European Network for Wood Science and Engineering : Edinburgh, Scotland, 13-14 October 20142014 / p. 229
• Effect of accelerated weathering on the mechanical properties of wood-plastic compositesKallakas, Heikko; Poltimäe, Triinu; Süld, Tiia-Maaja; Kers, JaanBaltic Polymer Symposium 2014 : programme and abstracts : Laulasmaa, Estonia, September 24-26, 20142014 / p. 75
• Effect of birch false heartwood on the physical and mechanical properties of wood-plastic composites [Online resource]Kallakas, Heikko; Martin, Mihkel; Ayansola, Gbenga; Poltimäe, Triinu; Krumme, Andres; Kers, JaanTartu Ülikooli ASTRA projekt PER ASPERA : Funktsionaalsed materjalid ja tehnoloogiad : [7-8 märtsil 2018, Tallinn : teesid] GSFMT Scientific Conference 2018 : Tallinn, March 7-8, 2018 : abstracts2018 / 1 p http://fmtdk.ut.ee/teesid-2018/
• Effect of chemical modification of wood flour on the mechanical properties of wood-plastic compositesKallakas, Heikko; Shamim, M. A.; Olutubo, T.; Poltimäe, Triinu; Süld, Tiia-Maaja; Krumme, Andres; Kers, JaanAgronomy research2015 / p. 639-653 : ill https://agronomy.emu.ee/vol133/13_3_2_B5.pdf https://www.scopus.com/sourceid/21100201050 https://www.scopus.com/record/display.uri?eid=2-s2.0-84937109059&origin=inward&txGid=426a38d426ed09396cb3af0bd47d7f43
• Effect of chemical modification of wood flour on the mechanical properties of wood-plastic composites [Electronic resource]Kallakas, Heikko; Shamim, M. A.; Olutubo, T.; Poltimäe, Triinu; Süld, Tiia-Maaja; Krumme, Andres; Kers, Jaan6th International Conference Biosystems Engineering 2015 : 7-8 May 2015, Tartu, Estonia : book of abstracts2015 / p. 94. [CD-ROM] http://bse.emu.ee/BSE2015_Book%20of%20ABSTRACTS_ISBN.pdf
• Effect of different hardwood species and lay-up schemes on the mechanical properties of plywoodKallakas, Heikko; Rohumaa, Anti; Vahermets, Harti; Kers, JaanForests2020 / art. 649, 13 p. : ill https://doi.org/10.3390/f11060649 https://www.scopus.com/sourceid/21100219934 https://www.scopus.com/record/display.uri?eid=2-s2.0-85087949354&origin=inward&txGid=35a5d7342c63aefcaa541bbaecf5e7c5 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=FORESTS&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000551901500001
• The effect of hardwood veneer densification on plywood density, surface hardness, and screw withdrawal capacityKallakas, Heikko; Kallakas, Heikko; Akkurt, Tolgay; Akkurt, Tolgay; Scharf, Alexander; Scharf, Alexander; Mühls, Fred; Mühls, Fred; Rohumaa, Anti; Rohumaa, Anti; Kers, Jaan; Kers, JaanForests2024 / art. 1275 https://doi.org/10.3390/f15071275
• Effect of hemp fiber surface treatment on the moisture/water resistance and reaction to fire of reinforced PLA compositesAlao, Percy Festus; Marrot, Laetitia; Kallakas, Heikko; Just, Alar; Poltimäe, Triinu; Kers, JaanMaterials2021 / art. 4332, 17 p. : ill https://doi.org/10.3390/ma14154332 https://www.scopus.com/sourceid/76627 https://www.scopus.com/record/display.uri?eid=2-s2.0-85112061036&origin=inward&txGid=7fd15e863ce595004501a99e938f7606 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=MATERIALS&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000682104600001
• Effect of hemp fibre length on the properties of polypropylene compositesAlao, Percy Festus; Kallakas, Heikko; Poltimäe, Triinu; Kers, JaanAgronomy research2019 / p. 1517–1531 : ill https://doi.org/10.15159/AR.19.146 https://www.scopus.com/sourceid/21100201050 https://www.scopus.com/record/display.uri?eid=2-s2.0-85076191803&origin=inward&txGid=f745831a0b619902e4f8fb56b99628a2
• Effect of hemp fibre length on the properties of polypropylene composites [Online resource]Alao, Percy Festus; Kallakas, Heikko; Kers, JaanTartu Ülikooli ASTRA projekt PER ASPERA : Funktsionaalsed materjalid ja tehnoloogiad : [4.-5. veebruar, 2019, Tartu : teesid]2019 / 1 p.: ill http://fmtdk.ut.ee/teesid-2019/
• Effect of lignin on veneer densification and set-recoveryKilumets, Catherine; Kallakas, Heikko; Ralph, Sally; Zhu, J. Y.; Hunt, Christopher Glaab; Rohumaa, Anti; Kers, JaanConstruction and building materials2024 / art. 138795 https://doi.org/10.1016/j.conbuildmat.2024.138795
• The effect of prestressing and temperature on tensile strength of basalt fiber-reinforced plywoodLõhmus, Rünno; Kallakas, Heikko; Tuhkanen, Eero; Gulik, Volodymyr; Kiisk, Madis; Saal, Kristjan; Kalamees, TargoMaterials2021 / art. 4701, 9 p. : ill https://doi.org/10.3390/ma14164701 https://www.scopus.com/sourceid/76627 https://www.scopus.com/record/display.uri?eid=2-s2.0-85113379402&origin=inward&txGid=66b951ac52e0a4273f75cd33d94573b8 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=MATERIALS&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000689433200001
• Effect of protein surface hydrophobicity and surface amines on soy adhesive strengthKallakas, Heikko; Plaza, Nayomi; Crooks, Casey; Turner, Derek; Gargulak, Mathew; Arvanitis, Matthew A.; Frihart, Charles R.; Hunt, Christopher G.Polymers2024 / art. 202 https://doi.org/10.3390/polym16020202
• The effect of surface properties on bond strength of birch, black alder, grey alder and aspen veneersRohumaa, Anti; Kallakas, Heikko; Mäetalu, Marja; Savest, Natalja; Kers, JaanInternational Journal of Adhesion and Adhesives2021 / art. 102945 https://doi.org/10.1016/j.ijadhadh.2021.102945 https://www.scopus.com/sourceid/13639 https://www.scopus.com/record/display.uri?eid=2-s2.0-85109546040&origin=inward&txGid=05293d225b3229fb413831634c0e5940 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=INT%20J%20ADHES%20ADHES&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000684801000010
• The effect of wood flour fraction size on the properties of wood-plastic compositesKängsepp, Kärt; Poltimäe, Triinu; Liimand, K.; Kallakas, Heikko; Süld, Tiia-Maaja; Repeshova, Irina; Goljandin, Dmitri; Kers, JaanProceedings of the 9th International Conference of DAAAM Baltic Industrial Engineering, 24-26th April 2014, Tallinn, Estonia2014 / p. 366-371
• Enhancing the bending strength, load-carrying capacity and material efficiency of aspen and black alder plywood through thermo-mechanical densification of face veneersAkkurt, Tolgay; Rohumaa, Anti; Kallakas, Heikko; Scharf, Alexander; Kers, JaanConstruction and building materials2024 / art. 138555 https://doi.org/10.1016/j.conbuildmat.2024.138555
• Fiber-reinforced plywood: Increased performance with less raw materialSaal, Kristjan; Kallakas, Heikko; Tuhkanen, Eero; Just, Alar; Rohumaa, Anti; Kers, Jaan; Kalamees, Targo; Lõhmus, RünnoMaterials2024 / art. 3218 https://doi.org/10.3390/ma17133218 https://www.scopus.com/sourceid/76627 https://www.scopus.com/pages/publications/85198353757?inward https://jcr.clarivate.com/jcr-jp/journal-profile?journal=MATERIALS&year=2024 https://www.webofscience.com/wos/woscc/full-record/WOS:001269724800001
• Fire and mechanical properties of hemp and clay boards for timber structuresKallakas, Heikko; Liblik, Johanna; Alao, Percy Festus; Poltimäe, Triinu; Just, Alar; Kers, JaanIOP conference series : earth and environmental science Central Europe towards Sustainable Building (CESB19) 2–4 July 2019, Prague, Czech Republic2019 / art. 012019, 8 p. : ill https://doi.org/10.1088/1755-1315/290/1/012019 https://www.scopus.com/sourceid/19900195068 https://www.scopus.com/record/display.uri?eid=2-s2.0-85068757629&origin=inward&txGid=6a0da084dbc5411f9a8f1468045064b4
• Impact of aspen and black alder substitution in birch plywoodAkkurt, Tolgay; Kallakas, Heikko; Rohumaa, Anti; Hunt, Christopher Glaab; Kers, JaanForests2022 / art. 142 https://doi.org/10.3390/f13020142
• Impact of cracks to the hygrothermal performance of cross laminated timberKukk, Villu; Püssa, Martin; Kallakas, Heikko; Kers, JaanProceedings of the 12th Meeting of the Northern European Network for Wood Science and Engineering (WSE) : Wood Science and Engineering - a Key Factor on the Transition to Bioeconomy : September 12-13, 2016, Riga, Latvia2016 / p. 143 http://www.kki.lv/dokumenti/WSE2016.pdf
• Impact of cracks to the hygrothermal properties of CLT water vapour resistance and air permeabilityKukk, Villu; Horta, R.; Püssa, Martin; Luciani, Giovanni; Kallakas, Heikko; Kalamees, Targo; Kers, JaanEnergy procedia2017 / p. 741-746 : ill https://doi.org/10.1016/j.egypro.2017.10.019 https://www.scopus.com/sourceid/17700156736 https://www.scopus.com/record/display.uri?eid=2-s2.0-85033378211&origin=inward&txGid=1b2ccd1fc69916ea75e9dea3c8a4883d https://www.webofscience.com/wos/woscc/full-record/WOS:000426435500124
• Impregnated wood performance in outdoor environmentTubli, Peeter; Kallakas, Heikko; Kers, Jaan; Brischke, C.; Humar, M.; Jones, D.Proceedings of the 12th Meeting of the Northern European Network for Wood Science and Engineering (WSE) : Wood Science and Engineering - a Key Factor on the Transition to Bioeconomy : September 12-13, 2016, Riga, Latvia2016 / p. 115-116 http://www.kki.lv/dokumenti/WSE2016.pdf
• The influence of accelerated weathering on the mechanical and physical properties of wood-plastic compositesKallakas, Heikko; Poltimäe, Triinu; Süld, Tiia-Maaja; Kers, Jaan; Krumme, AndresProceedings of the Estonian Academy of Sciences2015 / p. 94-104 : ill https://doi.org/10.3176/proc.2015.1S.05 https://www.scopus.com/sourceid/11500153303 https://www.scopus.com/record/display.uri?eid=2-s2.0-84925003947&origin=inward&txGid=8b80fd156bc781df0cea371a18fe36bb https://jcr.clarivate.com/jcr-jp/journal-profile?journal=P%20EST%20ACAD%20SCI&year=2015 https://www.webofscience.com/wos/woscc/full-record/WOS:000366504000006
• The influence of birch (Betula pendula) false heartwood on the mechanical properties of wood-plastic composites = Kase (Betula pendula) väärlülipuidu mõju puitplastkomposiitide mehaanilistele omadusteleKallakas, Heikko2019 https://digi.lib.ttu.ee/i/?12253
• Influence of birch false heartwood on the physical and mechanical properties of wood-plastic compositesKallakas, Heikko; Ayansola, Gbenga; Tumanov, Tanel; Goljandin, Dmitri; Poltimäe, Triinu; Krumme, Andres; Kers, JaanBioresources2019 / p. 3554-3566 : ill https://doi.org/10.15376/biores.14.2.3554-3566 https://www.scopus.com/sourceid/5900153306 https://www.scopus.com/record/display.uri?eid=2-s2.0-85071130130&origin=inward&txGid=a0ca612eea61409486a491d60b861350 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=BIORESOURCES&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000466449000077
• Introduction of the COST FP 1303 cooperative performance test [Electronic resource]Humar, M.; Brischke, C.; Kallakas, Heikko; Kers, JaanProceedings IRG Annual Meeting2015 / p. 1-22 : ill
• Investigation of efficient alkali treatment and the effect of flame retardant on the mechanical and fire performance of frost-retted hemp fiber reinforced PLAAlao, Percy Festus; Press, Raimond; Kallakas, Heikko; Ruponen, Jussi; Poltimäe, Triinu; Kers, JaanPolymers2022 / art. 2280 https://doi.org/10.3390/polym14112280 https://www.scopus.com/sourceid/54222 https://www.scopus.com/record/display.uri?eid=2-s2.0-85133667651&origin=inward&txGid=757b9b30035edba0ae07288cd00a6e4a https://jcr.clarivate.com/jcr-jp/journal-profile?journal=POLYMERS-BASEL&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000809465400001
• Mechanical and physical properties of hemp fiber-mat reinforced polyethylene film compositesYang, Xuejian; Kallakas, Heikko; Kers, JaanBiocomp 2016 : the 13th Pacific Rim Bio-Based Composite Symposium, Bio-Based Composites for the Sustainable Future : November 14th to 16th, 2016, Concepcion, Chile : abstracts2016 / p. 91 : ill http://publicaciones.udt.cl/wp-content/uploads/2017/05/Abstracts-Biocomp-2016-2.pdf
• Mechanical and physical properties of industrial hemp-based insulation materialsKallakas, Heikko; Närep, Merili; Närep, Aivo; Poltimäe, Triinu; Kers, JaanProceedings of the Estonian Academy of Sciences2018 / p. 183-192 : ill https://doi.org/10.3176/proc.2018.2.10 https://www.scopus.com/sourceid/11500153303 https://www.scopus.com/record/display.uri?eid=2-s2.0-85047533986&origin=inward&txGid=1e623cf73946e0b09c096c0c783cb830 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=P%20EST%20ACAD%20SCI&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000431735600008
• Mechanical and physical properties of silane crosslinked wood flour reinforced compositesKallakas, Heikko; Shamim, M. A.; Poltimäe, Triinu; Süld, Tiia-Maaja; Krumme, Andres; Kers, JaanProceedings of the 11th Meeting of the Northern European Network for Wood Sciences and Engineering (WSE) : September 14-15, 2015, Poznan, Poland2015 / p. 278
• Mechanical and physical properties of thermally modified wood flour reinforced polypropylene compositesKallakas, Heikko; Martin, Mihkel; Goljandin, Dmitri; Poltimäe, Triinu; Krumme, Andres; Kers, JaanAgronomy research2016 / p. 994-1003 : ill http://ise.elnet.ee/record=b2891902~S1*est https://www.scopus.com/sourceid/21100201050 https://www.scopus.com/record/display.uri?eid=2-s2.0-84969988886&origin=inward&txGid=68ddfb679baa71078c659322e97554a0
• Mechanical and physical properties of thermally modified wood flour reinforced polypropylene composites [Online resource]Kallakas, Heikko; Poltimäe, Triinu; Krumme, Andres; Kers, JaanTartu Ülikooli ASTRA projekt PER ASPERA : Funktsionaalsed materjalid ja tehnoloogiad : [7-8 märts 2017, Tartu : teesid]2017 / [1] p http://fmtdk.ut.ee/teesid/
• Natural weathering of bio-based façade materialsAlao, Percy Festus; Visnapuu, Kevin; Kallakas, Heikko; Poltimäe, Triinu; Kers, JaanForests2020 / art. 642, 12 p. : ill https://doi.org/10.3390/f11060642 https://www.scopus.com/sourceid/21100219934 https://www.scopus.com/record/display.uri?eid=2-s2.0-85087941290&origin=inward&txGid=33e0c4f9d18d15229087f3da03f06ec7 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=FORESTS&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000551904300001
• Preparation of thermoplastic cellulose esters in [mTBNH][OAC] ionic liquid by transesterification reactionTarasova, Elvira; Savale, Nutan Bharat; Krasnou, Illia; Kudrjašova, Marina; Rjabovs, Vitalijs; Reile, Indrek; Vares, Lauri; Kallakas, Heikko; Kers, Jaan; Krumme, AndresPolymers2023 / art. 3979 https://doi.org/10.3390/polym15193979 https://www.scopus.com/sourceid/54222 https://www.scopus.com/record/display.uri?eid=2-s2.0-85173843064&origin=inward&txGid=64df6b4be8664f05ce6fe62d1253629a https://jcr.clarivate.com/jcr-jp/journal-profile?journal=POLYMERS-BASEL&year=2023 https://www.webofscience.com/wos/woscc/full-record/WOS:001084697200001
• Properties of retted hemp fibres for reinforcement of compositesMarrot, Laetitia; Alao, Percy Festus; Kallakas, Heikko; Poltimäe, Triinu; Kers, Jaan; Mikli, Valdek; Mere, ArvoGSFMT Scientific Conference 2020 : Tallinn, February 4-5, 2020 : abstracts2020 / p. 13 : ill http://fmtdk.ut.ee/wp-content/uploads/2020/01/GSFMT2020.pdf
• Puidu lõiketöötlusKallakas, Heikko; Luga, Üllar; Riistop, MärtPuidutöötlemise õpik2025 / lk. 12-96 : ill., fot https://www.ester.ee/record=b5714083*est https://digikogu.taltech.ee/et/Item/32f67368-0b3f-4f3d-9c57-26b8d9d7bc93
• Saematerjali ja spooni kuivatus, puidu modifitseerimineKallakas, Heikko; Poltimäe, Triinu; Reiska, Rein; Riistop, MärtPuidutöötlemise õpik2025 / lk. 172-237 : ill https://www.ester.ee/record=b5714083*est https://digikogu.taltech.ee/et/Item/32f67368-0b3f-4f3d-9c57-26b8d9d7bc93
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• Tensile and surface hydrophobicity investigation of the novel synthesized cellulose derivative filmsKallakas, Heikko; Kilumets, Catherine; Tarasova, Elvira; Krasnou, Illia; Savest, Natalja; Gudkova, Viktoria; Ahmadian, Iman; Krumme, Andres; Kers, JaanResearch Square2022 / 13 p https://doi.org/10.21203/rs.3.rs-2191830/v1
• Tensile and surface wettability properties of the solvent cast cellulose fatty acid ester filmsKallakas, Heikko; Kattamanchi, Tanuj; Kilumets, Catherine; Tarasova, Elvira; Krasnou, Illia; Savest, Natalja; Ahmadian, Iman; Kers, Jaan; Krumme, AndresPolymers2023 / art. 2677 https://doi.org/10.3390/polym15122677 https://www.scopus.com/sourceid/54222 https://www.scopus.com/record/display.uri?eid=2-s2.0-85163782588&origin=resultslist&sort=plf-f&src=s&sid=06fbd9276af06d6fed52f32be88fd178&sot=b&sdt=b&s=TITLE-ABS-KEY%28%22Tensile+and+Surface+Wettability+Properties+of+the+Solvent+Cast+Cellulose+Fatty+Acid+Ester+Films%22%29&sl=99&sessionSearchId=06fbd9276af06d6fed52f32be88fd178&relpos=0 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=POLYMERS-BASEL&year=2023 https://www.webofscience.com/wos/woscc/full-record/WOS:001018034700001
• Uued inimesed ja positsioonidDelpeche-Ellmann, Nicole Camille; Leoste, Janika; Kallakas, Heikko; Püüa, Margus; Spalatu, Nicolae; Reinsalu, KristoMente et Manu2024 / lk. 60-63 : fot https://www.ester.ee/record=b1242496*est