Syabryaj,S.V. (1967)
Palynological investigation of the Brown Coal of the Middle Sarmatian age in Began deposit. [ Palinologichne doslidzhennya Burogo Vugillya Serednoho Sarmatu Beganskoho Rodovyshcha. ] Ukrainskii Botanichnyy Zhurnal,(Kiev)
Vol. 24 # 6 P. 55- 62