Template:Gulyaev, Ippolitov & Zaitsev, 2021
- Gulyaev, D.B., Ippolitov, A. P. & Zaitsev, B.A. 2021. New data on the Lower Callovian boreal ammonites of Crimea. Contributions to current cephalopod research: Morphology, Systematics, Evolution, Ecology and Biostratygraphy. Issue 6. Proceeding of conference (Moscow, 25 27 October, 2021). Moscow: PIN RAS. pp. 39–42. PDF