• New camerate crinoid genera from the Upper Ordovician (Katian) of Estonia: evolutionary origin of family Opsiocrinidae and a phylogenetic assessment of Ordovician MonobathridaCole, Selina R.; Toom, UrsulaJournal of systematic palaeontology2019 / p. 597-611 : ill https://doi.org/10.1080/14772019.2018.1447519 https://www.scopus.com/sourceid/5000155901 https://www.scopus.com/record/display.uri?eid=2-s2.0-85044475507&origin=inward&txGid=8a3d30c51c90d97039b5e69cb09792b4 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=J%20SYST%20PALAEONTOL&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000461902500003
• Site-selectivity of symbiotic (parasitic?) pits in crinoid column material from the middle Silurian (Wenlock: Sheinwoodian) of western EstoniaThomka, James R.; Vinn, Olev; Toom, UrsulaIchnos : an international journal for plant and animal traces2022 / p. 71-75 : ill https://doi.org/10.1080/10420940.2022.2047038 https://www.scopus.com/sourceid/33835 https://www.scopus.com/record/display.uri?eid=2-s2.0-85126725398&origin=inward&txGid=e4459b8dd4bf423fe93fee4558b54e76 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=ICHNOS&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000769801000001