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Author - title
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| details | Late Eifelian | USSR(Bashkir ASSR) | Chibrikova,E.V. Stratigraphy of Devonian and older Paleozoic deposits of the Southern Urals and the Pre-Urals (According to plant Microfssils). | 1977 | |
| details | Eifelian | USSR(European) | Arkhangelskaya,A.D. Spore-based zonation of the lower part of the Middle Devonian in the central and eastern European part of the USSR. | 1974 |