1. E. Brandenberger, F. de Quervain undH. Schinz, Helv. Med. Acta14, 195 (1947).
2. S. Ehrlich, Arch. Path. Anat. Physiol.283, 198 (1932).
3. K. Gemeinhardt, Pharmazeut. Ztg.85, 218 (1949).
4. D. Glick, Techniques of Histo- and Cytochemistry. New York: Interscience. 1949. S. 72ff.
5. R. A. Gortner, Biochem. Bull. (N. Y.)3, 468 (1914).