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

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

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

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