Teodorovich,V.I. (1980)
Grounds for the age determination of Middle Jurassic-Lower Callovian strata of the Cis-Timan area [ Obosnovanie vozrasta Sredneyursko-Nizhnekellovei Skoi Tolshch Pritimanya ] Byulleten Moskovskogo Obshchestva Ispytatelei Prirody, Otdel Geologicheskii
Vol. 55 # 6 P. 74- 83