1. Bern, H. A., Nishioka, R. S., Mewaldt, L. R., Farner, D. S.: Photoperiodic and osmotic influences on the ultrastructure of the hypothalamic neurosecretory system of the white-crowned sparrow, Zonotrichia leucophrys gambelii. Z. Zellforsch. 69, 198?227 (1966).
2. Carlsson, A., Falck, B., Hillarp, N.-Å.: Cellular localization of brain monoamines. Acta physiol. scand. 56, Suppl. 196, 1?28 (1962).
3. Clementi, F., Ceccarelli, B., Cerati, E., Demonte, M. L., Felici, M., Motta, M., Pecile, A.: Subcellular localization of neurotransmitters and releasing factors in the rat median eminence. J. Endocr. 48, 205?213 (1970).
4. Clementi, F., Ceccarelli, B., Cerati, E., Demonte, M. L., Pecile, A.: Subcellular organization of the median eminence. In: Advances in cytopharmacology (eds. F. Clementi, B. Ceccarelli), vol. 1, p. 331?342. New York: Raven Press 1971.
5. Couch, E. F., Arimura, A., Schally, A. V., Saito, M., Sawano, S.: Electron microscope studies of somatotrophs of rat pituitary after injection of purified growth hormone releasing factors (GRF). Endocrinology 85, 1084?1091 (1969).