1. Alfrey, C. P.: M. Lane: Seminars in Hematology.7, 149 (1970).
2. Bire, L. et al. Arch. Derm. (Chicago)92, 574 (1965).
3. Bemford, R.R. and C.P. Rhoads: Quart. J. Med.10, 175 (1941).
4. Been, T. H. and J. N. Dalton: Quart. J. Med.20, 75 (1951).
5. Brumpt, L. C.: Presse Med.26, 375 (1946).