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Krestovnikov, V. N. (1931). Kuyalnitskiy yarus. In: Archangelsky, A.D.; Davitashvili, L.S. (eds) Rukovodyashchiye iskopayemyye neftyenosnykh rayonov Krymsko-Kavkazskoy oblasti, X. Trudy Gosudarstvennogo Issledovatel'skogo Neftyanogo Instituta. 1-24.