(M. M. G. )& Bitter and Bitter, (C. D. S. )&, ?Abh. Naturwiss. Vereine Bremen 24: 428. 1919.?, 1919.

(C. D. S. )& Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 441. 1919.?, 1919.

(C. D. S. )& Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 388. 1919.?, 1919.