• Lower and Middle Ordovician bio- and chemostratigraphy of the Aizpute-41 drill core, LatviaLieffroy, Thibaud; Ainsaar, Leho; Männik, Peep; Meidla, Tõnu; Nõlvak, Jaak; Hints, OlleXI Baltic Stratigraphical Conference : abstracts and field guide2024 / p. 22 https://www.ester.ee/record=b5696260*est https://files.geocollections.info/71c8154a-ede7-4a3a-9989-88de5c5848f6.pdf