Authors Year Title
Stepanova , Kucheva & Shkolin 2001 Novye materialy po stratigrafii i ammonoideyam verkhneserpukhovskikh otlozhenii na r. Iseti [New materials on stratigraphy and ammonoids of the Upper Serpukhovian on the Iset River]
Evolution of life on Earth. Proceedings of the II International Symposium. Tomsk: Izd. Nnauch. Tech. Literatury, pp. 233-236.