Less, G.; Özcan, E.; Báldi-Beke, M.; Kollányi, K. (2007). Thanetian and early Ypresian orthophragmines (foraminifera: Discocyclinidae and Orbitoclypeidae) from the central western Tethys (Turkey, Italy and Bulgaria) and their revised taxonomy and biostratigraphy. Rivista Italiana di Paleontologia e Stratigrafia. 113(3): 419-448.
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Less, G.; Özcan, E.; Báldi-Beke, M.; Kollányi, K.
2007
Thanetian and early Ypresian orthophragmines (foraminifera: Discocyclinidae and Orbitoclypeidae) from the central western Tethys (Turkey, Italy and Bulgaria) and their revised taxonomy and biostratigraphy