Podobina, V.M., V.M. Kabanova, and T.G. Kseneva. 1997. “Change of Micropaleontological Assemblages at the Cretaceous-Paleogene Boundary in Western Siberia”. Journal of Palaeosciences 46 ((1-2):156-60. https://doi.org/10.54991/jop.1997.1332.