@ARTICLE{Iskra_Lakova_Towards_2013, author={Iskra Lakova and Petrova, Silviya}, volume={vol. 63}, number={No 2}, journal={Acta Geologica Polonica}, howpublished={online}, year={2013}, publisher={Komitet Nauk Geologicznych PAN}, publisher={WydziaƂ Geologii UW}, title={Towards a standard Tithonian to Valanginian calpionellid zonation of the Tethyan Realm}, URL={http://journals.pan.pl/Content/81906/PDF/03_lakowa.pdf}, doi={10.2478/agp-2013-0008}, }