Dzyuba, O. S., Goryacheva, A. A., Ruban, D. A., Gnezdilova, V. V., & Zayats, P. P. (2016). New data on Callovian (Middle Jurassic) belemnites and palynomorphs from the Northern Caucasus, southwest Russia. Geologos, 22(1), 49–59. https://doi.org/10.1515/logos-2016-0004