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Collier, Mary J.; Gaier, Eugene L. (1959). American Imago, 16(2): 177-194
Collier, Mary J.; Gaier, Eugene L. (1958). American Imago, 15(4): 401-410
Collier, Mary Jeffery; Gaier, Eugene L. (1961). American Imago, 18(2): 187-204