	Authors	Year	Title
	Nikolaeva & Nigmadzhanov	1992	Pogranichnye otlozheniya Nizhnego i Srednego Karbona v Yuzhnom Tyan'-Shane. Isvestiya Akademii Nauk, Seriya geologicheskaia, 2, 1992: 97-104, fig.1,2, pl.1; Moskva.