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| details | Nd | Nd | Pant,D.D. Suggestions for the classification and nomenclature of fossil spores and pollen grains | 1954 | |
| original | Westphalian | USSR(Ukrainian SSR) | Naumova,S.N. Spores and pollen of coals of the USSR. | 1939 | |
| original | Westphalian | USSR(Ukrainian SSR) | Lyuber,A.A. et al. Classification and stratigraphic value of spores of some Carboniferous Coal deposits in the USSR. | 1938 |