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Author - title
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| details | Roadian | Wordian | Canada(Arctic) | Utting,J. et al. Late Permian palynomorph assemblages from Ufimian and Kazanian sequences in Russia, and comparison with Roadian and Wordian assemblages from the Canadian Arctic | 1997 |
| details | Roadian | Ufimian | Barents Sea | Grigoriev,M. et al. Sedimentology, palynostratigraphy, palynofacies and thermal maturity of Upper Permian rocks of Kolguyev Island, Barents Sea Russia | 1998 |