• Distribution of conichnus and amphorichnus in the lower paleozoic of Estonia (Baltica)Vinn, Olev; Wilson, Mark A.; Toom, UrsulaCarnets de Geologie2015 / p. 269 - 278 https://doi.org/10.4267/2042/58180 https://www.scopus.com/sourceid/7000153259 https://www.scopus.com/record/display.uri?eid=2-s2.0-84953271795&origin=inward&txGid=469fa3c1be1c6a24b53e191db1f6e0f1