Biometry and lifestyle of the Ordovician proetide trilobite Cyamella stensioei Owens, 1979Popp, Adrian; Pärnaste, HeljeGFF2011 / p. 111-123 : ill

Cryptic encrusting fauna inside invertebrate fossils from the Ordovician of EstoniaVinn, Olev; Ernst, Andrej; Toom, Ursula; Isakar, MareAnnales societatis geologorum Poloniae2018 / p. 285-290 : ill https://doi.org/10.14241/asgp.2018.008 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Distribution of proetid trilobites in BaltoscandiaPopp, Adrian; Pärnaste, HeljeThe Seventh Baltic Stratigraphical Conference : 17-18 May 2008, Tallinn, Estonia : abstracts & field guide2008 / p. 52

Distribution of the Proetida (Trilobita) in Baltoscandian Ordovician strataPärnaste, Helje; Popp, Adrian; Owens, Robert M.Estonian journal of earth sciences2009 / 1, p. 10-23 : ill https://artiklid.elnet.ee/record=b1205583*est

Eestist leiti maailma vanim kivistunud silmEesti Loodus2018 / lk. 7 : fot http://www.ester.ee/record=b1072059*est

First record of Telephina (Trilobita) from the Ordovician of northeastern Estonia and its stratigraphical implicationsPärnaste, Helje; Popp, AdrianEstonian journal of earth sciences2011 / 2, p. 83-90 : ill https://artiklid.elnet.ee/record=b2414183*est

High-resolution trilobite stratigraphy of the Lower–Middle Ordovician Öland Series of BaltoscandiaPärnaste, Helje; Bergström, Jan; Zhiyi, ZhouGeological magazine2012 / p. 1-10 : ill https://pubs.geoscienceworld.org/geolmag/article-abstract/150/3/509/299539/High-resolution-trilobite-stratigraphy-of-the

Hirnantia sagittifera (Brachiopoda) and Mucronaspis mucronata s.l. (Trilobita) in the Upper Ordovician of the East Baltic : taxonomy and distributionHints, Linda; Pärnaste, Helje; Gailite, Lilita-IlgaEstonian journal of earth sciences2012 / p. 65-81 : ill https://www.researchgate.net/publication/258439664_Hirnantia_sagittifera_Brachiopoda_and_Mucronaspis_mucronata_sl_Trilobita_in_the_Upper_Ordovician_of_the_East_Baltic_Taxonomy_and_distribution

Investigating the role of marine redox conditions in an early silurian mass extinction (ireviken event) : a deeper water perspectiveGovert, Daniel J.; Young, Seth, A.; Kaljo, Dimitri; Hints, Olle; Martma, Tõnu; Owens, Jeremy D.; Noble, Paula J.Geological Society of America Abstracts with Programs, vol. 52, no. 22020 / paper no. 32-4 https://doi.org/10.1130/abs/2020SE-344788

On the lower boundary of the Floian Stage in EstoniaPärnaste, Helje; Viira, ViiveEstonian journal of earth sciences2012 / p. 205-209 https://artiklid.elnet.ee/record=b2551998*est

Ordovician proetid trilobites in Baltoscandia and Germany = Baltoscandia ja Saksamaa Ordoviitsiumi proetiidsed trilobiididPopp, Adrian2011

Sompast leiti 460 miljonit aastat vana merelooma kivistis : [kommentaar TTÜ geoloogia instituudi vanemteadurilt Helje Pärnastelt]Postimees2011 / lk. 3

Suurte silmadega väike mereelukas TelephinaPärnaste, HeljeEesti Loodus2012 / lk. 20-23 : ill https://artiklid.elnet.ee/record=b2495111*est

The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of EstoniaVinn, Olev; Toom, Ursula; Isakar, MareEstonian journal of earth sciences2017 / p. 193-197 : ill https://doi.org/10.3176/earth.2017.19

The Early Ordovician trilobite distribution and zonation of the East BalticPärnaste, HeljeProceedings of the Estonian Academy of Sciences. Geology2006 / 2, p. 109-127 : ill

Trilobites and biofacies in the Early-Middle Ordovician of Baltica and a brief comparison with the Yangtze PlateBergström, Jan; Pärnaste, Helje; Zhiyi, ZhouEstonian journal of earth sciences2013 / p. 205-230 : ill https://artiklid.elnet.ee/record=b2651566*est