@incollection{fra_2008.382, title = {Problematic determination of ribbed Cretaceous nautiloids, example of Eutrephoceras columbinum (Fritsch, 1872) vs. Cymatoceras atlas (Whiteaves, 1876)}, author = {Frank, Jiří }, year = {2008}, booktitle = {Pisera: 9th Paleontological Conference - Warszazwa, 10–11 October 2008 – Abstracts}, publisher = {Institute of Paleobiology – Polish Academy of Sciences Warschau}, journal = {Institute of Paleobiology – Polish Academy of Sciences Warschau}, volume = {}, pages = {25–26}, url = {https://web.archive.org/web/20181130150808/http://www.paleo.pan.pl/conferences/9thPALEOCONF2008/Konferencja_2008.pdf} }