1. Bj�rklund, A., B. Ehinger, and B. Falck: A method for differentiating dopamine from noradrenaline in tissue sections by microspectrofluorometry. J. Histochem. Cytochem. 16, 263?276 (1968).
2. - - - Dopamine and noradrenaline in retinal adrenergic neurons. (To be published 1969).
3. Bloom, G. E., E. Costa, and G. C. Salmoiraghi: Anesthesia and the responsiveness of individual neurons of the cat to acetylcholine, norepinephrine and dopamine administered by microelectrophoresis. J. Pharmacol. exp. Ther. 150, 244?252 (1965).
4. Carlsson, A., B. Falck, and N.-�. Hillaep: Cellular localization of brain monoamines. Acta physiol. scand. 56, Suppl. 196, 1?28 (1962).
5. Corrodi, H., and G. Jonsson: The formaldehyde fluorescence method for the histochemical demonstration of biogenic monoamines. A review on the methodology. J. Histochem. Cytochem. 15, 65?78 (1967).