• Rare tool marks from the Upper Ordovician of Estonia (Baltica)Vinn, Olev; Toom, UrsulaNeues Jahrbuch für Geologie und Paläontologie - Abhandlungen2016 / p. 221-226 : ill https://doi.org/10.1127/njgpa/2016/0596 https://www.scopus.com/sourceid/25103 https://www.scopus.com/record/display.uri?eid=2-s2.0-85028455336&origin=inward&txGid=c708c2836da3d3d67d45efa506d40270 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=NEUES%20JAHRB%20GEOL%20P-A&year=2016 https://www.webofscience.com/wos/woscc/full-record/WOS:000385858400001