Megaspores in the Lower and Middle Carboniferous of the Donets Basin. (In: Geology and Coal Formation and stratigraphy of the Carboniferous of the USSR)
Foreign title:
Megaspory Nizhnego i Srednego Karbona Donetskogo Basseina(In-Geologiya Uglenoshykh Formatsii i Stra stratigrafiya Karbona Sssr)