• Micro-coprolites inside Ordovician body fossils from EstoniaToom, Ursula; Isakar, Mare; Hints, Olle; Madison, A.; Vinn, Olev13th International Symposium on the Ordovician System : Novosibirsk, Russia (July 19-22, 2019) : contributions2019 / p. 211-213 : ill http://www.igcp653.org/wp-content/uploads/2019/07/ISOS13Proceedings.pdf
• Small faecal pellets in Ordovician shelly fossils from Estonia, BaltoscandiaToom, Ursula; Vinn, Olev; Isakar, Mare; Madison, Anna; Hints, OlleEstonian journal of earth sciences2020 / p. 1-19 : ill https://doi.org/10.3176/earth.2020.01 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85078733661&origin=inward&txGid=4a5eae9af8f7fdd6d216daa61f396fc6 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000519573600001