Petrova,L.D. et al. (1980)
Palynological characteristics of Gas-bearing Triassic deposits of the Vilyuysk Syncline. [ Palinologicheskaya kharakteristika Hasonosnykh Triasovykh otlozheniy Vilyuyskoy Sineklizy. ] International Palynological Conference,5th.Palynology in the USSR,Akademiya Nauk SSR,(Cambridge)
P. 68- 69