1. Trilobites;Adrain,2004
2. Middle and Upper Ordovician carbon isotope chemostratigraphy in Baltoscandia: a correlation standard and clues to environmental history;Ainsaar;Palaeogeography, Palaeoclimatology, Palaeoecology,2010
3. Trilobita;Ancygin,1973
4. Trilobites of the Karakol'-Mikhailovsk horizon of the Lower Ordovician of the southern Urals;Ancygin;Trudy Instituta Geologij i Geohimij, Akademiya Nauk SSSR, Uralskiy Nauchnyy Centr,1977
5. The Lower Ordovician trilobites of the Mayachnaya Gora in Bredin region;Ancygin;Trudy Instituta Geologii i Geohimii, Akademiya Nauk SSSR,1978