Mineralogical composition of the Lower and Upper Kazanian (Mid-Permian) rocks and facies distribution at the Petchischi region (Eastern Russian Platform)
Svetlana O. Zorina,
Carbonates and Evaporites, 32(1), 27, 2017,
DOI: 10.1007/s13146-015-0272-3

Isotope Stratigraphy of the Permian Rocks, the Volga River Region
N. G. Nurgalieva, B. I. Gareev, D. K. Nurgaliev,
Advances in Characterization and Analysis of Expansive Soils and Rocks, 202-204, 2018,
DOI: 10.1007/978-3-319-61931-6_16