• The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of EstoniaVinn, Olev; Toom, Ursula; Isakar, MareEstonian journal of earth sciences2017 / p. 193-197 : ill https://doi.org/10.3176/earth.2017.19 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85033595042&origin=inward&txGid=40c12fb6b25417307ab5e19d68dcfdc6 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2017 https://www.webofscience.com/wos/woscc/full-record/WOS:000414520500003