• Possible drill holes and pseudoborings in obolid shells from the Cambrian/Ordovician boundary beds of Estonia and the uppermost Cambrian of NW RussiaVinn, Olev; Holmer, Lars E.; Wilson, Mark A.; Isakar, Mare; Toom, UrsulaHistorical Biology : An International Journal of Paleobiology2021 / p. 3579-3584 https://doi.org/10.1080/08912963.2021.1878355 https://www.scopus.com/sourceid/13916 https://www.scopus.com/record/display.uri?eid=2-s2.0-85100216254&origin=inward&txGid=2642d491a97f146b95981136bc771bfe https://jcr.clarivate.com/jcr-jp/journal-profile?journal=HIST%20BIOL&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000613380000001