1. Adams, C. W. M.: A stricter interpretation of the ferric ferricyanide reaction with particular reference to the demonstration of protein-bound sulphydryl and di-sulphide groups. J. Histochem. Cytochem. 4, 23?35 (1956).
2. Adams-Ray, J., G. Bloom and M. Ritzén: Cells with autofluorescent granules in dermis of human skin and their correlation to degree of pigmentation. Acta morph. neerl.-scand. 3, 131?134 (1960).
3. , et H. Nordenstam: Un système de cellules chromaffines dans la peau Humaine. Lyon chir. 52, 125?129 (1956).
4. Barka, T., and P. J. Anderson: Histochemistry, theory, practice and bibliography. New York: Harper & Row, Inc. 1963.
5. Barter, R., and A. G. E. Pearse: Detection of 5-hydroxytryptamine in mammalian enterochromaffin cells. Nature (Lond.) 172, 810 (1953).