1. Strugger, S., Fluoreszenmicroscopie und microbiologie (M. and H. Shaper, Hanover, 1949).
2. Everson-Pearse, A. G., Histochemistry, 732 (J. and A. Churchill, London, 1960).
3. Krebs, A. T., and Gierlach, A. Z., Amer. J. Roent. and Rad. Therapy, 65, 1, 93 (1951).
4. Armstrong, J. A., Exp. Cell. Res., 11, 640 (1956).
5. Beers, R. F., Hendley, D. D., and Steiner, R. F., Nature, 182, 242 (1958).