1. Azerad, et Grupper: in: Les Reactions organiques non sp�zifiques en Dermatologie, Paris: Masson et Cie. 1952.
2. Baumberger, J. P., V. Suntzeff and E. V. Cowdry: J. nat. Cancer Inst. 2, 413 (1942).
3. Beloff, A., and R. A. Peters: J. Physiol. (Lond.) 103, 461 (1945).
4. Braun-Falco, O.: Arch. klin. exp. Derm. 198, 111 (1954).
5. Braun-Falco, O.: Hautarzt 5, 25 (1954).