Zakonomernosti formirovani︠i︡a i razmeshcheni︠i︡a skopleniĭ prirodnykh bitumov : Sbornik trudov - Beskrovnyĭ, Nikolaĭ Sergeevich (Trudy Vseso︠i︡uznogo neft︠i︡anogo nauchno-issledovatelʹskogo geologo-razvedochnogo instituta., 1979)