@ARTICLE{Keutgen_Norbert_Early_2012,
 author={Keutgen, Norbert and Walaszczyk, Ireneusz and Remin, Zbigniew},
 volume={vol. 62},
 number={No 4},
 journal={Acta Geologica Polonica},
 howpublished={online},
 year={2012},
 publisher={Komitet Nauk Geologicznych PAN},
 publisher={Wydział Geologii UW},
 title={Early representatives of the belemnite genus Belemnella (Cephalopoda) from the uppermost Campanian–Lower Maastrichtian of the Middle Vistula River section, central Poland},
 URL={http://journals.pan.pl/Content/81895/PDF/03keutgen.pdf},
 doi={10.2478/v10263-012-0029-4},
}