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Maderni, U.N. (1964). Obshchiye problemy stratigrafii i biostratigrafiya paleogena Turgaya i Sredney Azii [General problems of stratigraphy and biostratigraphy of the Turgay Paleogene and Central Asia]. Trudy Vsesoyuznogo nauchno-issledovatel'skogo geologicheskogo instituta. 102: 173-184.