1. Björklung, A., Falck, B., Owman, Ch.: Fluorescence microscopic and microspectrofluorometric techniques for the cellular localization and characterization of biogenic monoamines. In: Methods of investigative and diagnostic endocrinology, vol. 1 (J.E. Rall and I.J. Kopin, eds) pp. 318?368. Amsterdam: North-Holland 1972
2. Coons, A.H., Leduc, E.H., Conolly, J.M.: Studies on antibody production. I. A method for the histochemical demonstration of specific antibody and its application to a study of the hyperimmune rabbit. J. Exp. Med. 102, 49?60 (1955).
3. Håkanson, R., Bengmark, S., Brodin, E., Ingemansson, S., Larsson, L.-I., Nilsson, G., Sundler, F.: Substance P-like immunoreactivity in intestinal carcinoid tumours. Nobel Symp. on Substance P, Stockholm 1976, to be published 1977
4. Håkanson, R., Owman, Ch., Sporrong, B., Sundler, F.: Electron microscopic classification of amine-producing endocrine cells by selective staining of ultra-thin sections. Histochemie 27, 226?242 (1971)
5. Heitz, Ph., Polak, J.M., Timson, C.M., Pearse, A.G.E.: Enterochromaffin cells as the endocrine source of gastrointestinal substance P. Histochemistry 49, 343?348 (1976)