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DIAGNOSIS OF THE GENUS PTYCHOCERAS D'ORBIGNY.EGOJAN VL.1969; DOKL. EARTH SCI. SECT.; USA; 1969(6), VOL. 182, P. 228 A 230Miscellaneous

INTERNAL STRUCTURE OF THE SHELL IN THE GENUS PTYCHOCERAS D'ORBIGNYDRUSHCHITS VV; DOGUZHAYEVA LA; DOGUZHAEVA LA et al.1976; DOKL. EARTH SCI. SECT.; USA; DA. 1976; VOL. 230; PP. 249-251; BIBL. 7 REF.; 1 ILL.;[DOKL. AKAD. NAUK S.S.S.R.; SUN; DA. 1976; VOL. 230; NO 5; PP. 1210-1213]Article