Detailed stratigraphic scheme of the Upper Oxfordian-Valaginian of the northern Caucasus according… Makarieva
Makarieva (1979): Detailed stratigraphic scheme of the Upper Oxfordian-Valaginian of the northern Caucasus according to Tintinnina $[In Russian with English summary] – Voprosy Mikropaleont. – 22: 50 - 63.