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Mrevlishvili, N. I. (1972). О систематическом значении некоторых морфологических признаков нуммулитов - On the systematic significance of some morphological features of nummulites. Trudy Tbilis. Gosudarst. Univ., (fiz.-mat. i estestv. nauki). 4(146): 183-191 (in Russian with Georgian summary).
Mrevlishvili, N. I. (1972). О систематическом значении некоторых морфологических признаков нуммулитов - On the systematic significance of some morphological features of nummulites. Trudy Tbilis. Gosudarst. Univ., (fiz.-mat. i estestv. nauki). 4(146): 183-191 (in Russian with Georgian summary).