[Ostracods of the family Primitiopsidae and Beyrichiidae of the Silurian of the western slope of the Central Urals.] Trudy Instituta Geologii i Geokhimii Akademiya Nauk SSSR Ural'skii Nauchnyi Tsentr, No. 119 1975: 83-101. 89 [Zoological Record Volume 122]