(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 454. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 351. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 385. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 408. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 449. 1919.?, 1919.

(D. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 327. 1919.?, 1919.

Bitter and Bitter, (D. ), ?Abh. Naturwiss. Vereine Bremen 24: 326. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 493-494. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 381. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 435. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 347. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 350. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 484. 1919.?, 1919.

(D. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 483. 1919.?, 1919.

(D. ) Bitter and Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 481. 1919.?, 1919.

(D. ) Bitter, ?Abh. Naturwiss. Vereine Bremen 24: 374. 1919.?, 1919.