Kirikiltsa,S.I. et al. (1978)
Barite concentration in Cretaceous sediments of the Chernigovka Trough in the Azov Block of Crystalline Rocks [ Baritonosnost Melovykh otlozheniy Chernigovskoy Depressii Priazovskogo Kristallicheskogo Massiva ] Doklady Akademii Nauk SSSR
Vol. 241 # 3 P. 661- 663