@ARTICLE{Machalski_Marcin_Stratigraphically_2012,
 author={Machalski, Marcin},
 volume={vol. 62},
 number={No 1},
 journal={Acta Geologica Polonica},
 howpublished={online},
 year={2012},
 publisher={Komitet Nauk Geologicznych PAN},
 publisher={Wydział Geologii UW},
 title={Stratigraphically important ammonites from the Campanian–Maastrichtian boundary interval of the Middle Vistula River section, central Poland},
 URL={http://ochroma.man.poznan.pl/Content/81870/PDF/machalski.pdf},
 doi={10.2478/v10263-012-0004-0},
}