TY - JOUR L1 - http://journals.pan.pl/Content/81895/PDF/03keutgen.pdf L2 - http://journals.pan.pl/Content/81895 PY - 2012 IS - No 4 DO - 10.2478/v10263-012-0029-4 A1 - Keutgen, Norbert A1 - Walaszczyk, Ireneusz A1 - Remin, Zbigniew PB - Komitet Nauk Geologicznych PAN PB - Wydział Geologii UW VL - vol. 62 DA - 2012 T1 - Early representatives of the belemnite genus Belemnella (Cephalopoda) from the uppermost Campanian–Lower Maastrichtian of the Middle Vistula River section, central Poland UR - http://journals.pan.pl/dlibra/publication/edition/81895 T2 - Acta Geologica Polonica ER -