Discovery of rich Katian-Hirnantian jawed polychaete fauna from the Prague Basin, Czech RepublicTonarova, Petra; Vodražkova, Stanislava; Čap, Pavel; Hints, Olle; Nõlvak, Jaak; Kubajko, MichalLille 2021 : Ordovician of the World : programme with abstracts2021 / p. 75-76 https://docplayer.net/219093593-Programme-with-abstracts-2021-virtual-annual-meeting-of-igcp-virtual-annual-meeting-of-igcp-735.html

Late Ordovician and Early Silurian stromatoporoid sponges from Anticosti Island, Eastern Canada : crossing the O/S mass extinction boundaryNestor, Heldur; Copper, Paul; Stock, Carl2010 https://www.ester.ee/record=b2627279*est

New bioclaustration in trepostome bryozoans from the Late Ordovician (Sandbian) of EstoniaVinn, Olev; Ernst, Andrej; Wilson, Mark A.; Toom, UrsulaLille 2021 : Ordovician of the World : programme with abstracts2021 / p. 78 https://docplayer.net/219093593-Programme-with-abstracts-2021-virtual-annual-meeting-of-igcp-virtual-annual-meeting-of-igcp-735.html

Конодонты ордовика Прибалтики : /специальность № 128 - палеонтология и стратиграфия : диссертация на соискание ученой степени кандидата геолого-минералогических наукViira, Viive1970 https://www.ester.ee/record=b4416494*est

Конодонты ордовика Прибалтики : автореферат ... кандидата геолого-минералогических наук (128)Viira, Viive1970 https://www.ester.ee/record=b1397871*est