1. Bingley, G. W., and A. Brockmole: Arch. of Dermat. 50, 326 (1944).
2. Bordet, P.: Ann. Inst. Pasteur 56, 325 (1936); Ref. Zbl. Hautkrkh. 54, 654 (1937).
3. Choure, S. G.: Vestn. Venerol. i Dermat. 11, 14 (1940); Ref. Zbl. Hautkrkh. 67, 158 (1941).
4. Cormia, F. E., G. M. Lewis and M. E. Hopper: J. Investig. Dermat. 7, 375 (1947).
5. Falk, C. A.: Acta dermato-vener. (Stockh.) 28, 342 (1948).