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3. New stratigraphic scheme of the lower Aptian in the Volga River middle courses;Baraboshkin;Stratigr. Geol. Correl.,2002
4. Cretaceous stratigraphic scale of Russia: the state of arts, the main problems, ways to improve;Baraboshkin,2013
5. Marine micropaleontology: an introduction;Berggren,1978