1) Williams, T.H.: Electron microscopic evidence for an autonomic interneuron. Nature 214, 309-310 (1965)
2) Bjorklund, A., Cegrell, L., Falck, B., Ritzen, M. and Rosengren, E.: Dopamine containing cells in sympathetic ganglia. Acta Physiol. Scand. 78, 334-338 (1970)
3) Bjorklund, A., Ehinger, B. and Falck, B.: A method for differentiating dopamine from noradrenaline in tissue section by microspectro fluorimetry. J. Histochem. Cytochem. 16, 263-270 (1968)
4) Libet, B.: Functional roles of SIF cells in slow synaptic actions. In Histochemistry and Cell Biology of Autonomic Neurons, SIF cells, and Paraneurons, Edited by Eränkö, O., Soinila, S. and Päivdrintä, H., Advances in Biochemical Pyschopharmacology, Vol. 25, p. 111-118, Raven Press, New York (1980)
5) Stjarne, L.: The synthesis, uptake and storage of catecholamines in the adrenal medulla. In Catecholamines, Handbook of Exp. Pharmacol. New Series XXXIII, Edited by Blasko, H. and Musholl, E., p. 231-269, Springer, Berlin, Heidelberg and New York (1972)