Chabakov, A.W. (1927)
O nachodke w kamennougolnych otloshenijach SSSR jajzewych kapsul elasmobranchij Palaeoxyris i Vetacapsula. (About the find of elasmobranch egg capsules from Carboniferous deposits of the USSR) [In Russian] Westnik geologitscheskogo komiteta, 1: 33–34
Chabakov, A.W. (1949)
O dwuch nowych formach problematitschnych iskopayemych Crookallia is karbona Donetzkogo basseyna i Palaeoxyris is jury Krima. [About two new problematic fossils Crookallia from the Carboniferous of Donezk Basin and Palaeoxyris from the Jurassic of Crimea]. Annual of the All–Union Paleontological Society, 13: 83–87, Pl. IX [in Russian].