Dmitrispirifer Lyashenko 1973

Lyashenko 1973. [Brachiopods and stratigraphy of Lower Frasnian deposits of the south Timan and the Volga-Ural oil-gas bearing province.] Vsesoyuznyi Nauchno-Issledovatelskii Geologorazvedochnyi Neftyanoi Institut Trudy Instituta, 134 1973: 1-279