• Latest Ordovician age of the Spinachitina fragilis Chitinozoan Biozone in BaltoscandiaNõlvak, Jaak; Liang, Yan; Hints, OlleEstonian journal of earth sciences2023 / p. 82-85 : ill https://doi.org/10.3176/earth.2023.51 https://www.scopus.com/sourceid/6000195392 https://www.scopus.com/record/display.uri?eid=2-s2.0-85164595140&origin=inward&txGid=d237bbf8ecf83d0d4985626bb14438ec https://jcr.clarivate.com/jcr-jp/journal-profile?journal=EST%20J%20EARTH%20SCI&year=2023 https://www.webofscience.com/wos/woscc/full-record/WOS:001015399200006