D. A. Kukhtinov, V. R. Lozovsky, S. A. Afonin, E. A. Voronkova; Non-marine ostracods of the Permian-Triassic transition from sections of the East European Platform. Italian Journal of Geosciences ; 127 (3): 717–726. doi:
For the first time the non-marine ostracod association of the Vjaznikovian Gorizont, late Tatarian, in the East European platform is described. The ostracod fauna consists of non-marine forms which are typical of the youngest horizons of the late Tatarian from the Eat European platform, as well as of some species which are known from the Permian and (?) Triassic beds of Siberia. Vjaznikovian ostracods occupy the highest position in the Permina, at the transition into the Triassic.