Podobina, V., V. Kabanova, and T. Kseneva. “Change of Micropaleontological Assemblages at the Cretaceous-Paleogene Boundary in Western Siberia”. Journal of Palaeosciences, vol. 46, no. (1-2), Dec. 1997, pp. 156-60, doi:10.54991/jop.1997.1332.