1. Barber: Lancet 1947, 791.
2. Biach: Wien. klin. Wschr. 1930 I, 528.
3. Blum: Ann. Mal. vénér. 30, 657 (1935); 33, 521 (1938). Ref. Zbl. Hautkrkh. 62, 143 (1939).
4. Buschke u. Jost: Zbl. Hautkrkh. 23, 473 (1927).
5. Crance: Amer. J. Syph. 11, 262 (1927).