Evolution of a Katian tropical hardgroundToom, Ursula; Kröger, Björn; Knaust, Dirk; Moghalu, Ogechukwu Ann; Vöröš, Dominik; Vodrážková, StanislavaXI Baltic Stratigraphical Conference : abstracts and field guide2024 / p. 39 https://www.ester.ee/record=b5696260*est https://files.geocollections.info/95c3f9cd-1a5f-428b-a1a6-517682aced9d.pdf

Ichnogenus Trypanites in the Ordovician of Estonia (Baltica)Toom, Ursula; Kuva, Jukka; Knaust, DirkEstonian journal of earth sciences2023 / p. 106-109 : ill https://doi.org/10.3176/earth.2023.48 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Some encrusted hardgrounds from the Ordovician of Estonia (Baltica)Vinn, Olev; Toom, UrsulaCarnets de Geologie2015 / p. 63 - 70 https://doi.org/10.4267/2042/56744 Journal metrics at Scopus Article at Scopus