1. Regularities in the development of Carboniferous flora and the phytostratigraphical subdivision of the Middle Carboniferous in the Donets basin;Fissunenko,1965
2. Occurrence and significance of marine animal remains in American coal balls;Mamay;U.S. Geol. Surv., Prof. Pap.,1962
3. Carboniferous flora of the European part of the U.S.S.R.;Novik;Paleontol. S.S.S.R., N. Ser.,1952
4. An anatomical study of the plant remains from the Donets coal balls. 1. Lepidodendraceae;Snigirevskaya;Tr. Bot. Inst. Akad. Nauk S.S.S.R., Ser. 8, Paleobot.,1964
5. The remains of calamities and psaroniaceous ferns in coal balls of the Donets basin;Snigirevskaya;Tr. Bot. Inst. Akad. Nauk S.S.S.R., Ser. 8, Paleobot.,1967