%0 Journal Article %A J Schipper %A F J Tilders %A J S Ploem %T Extraneuronal catecholamine as an index for sympathetic activity: a scanning microfluorimetric study on the iris of the rat. %D 1979 %J Journal of Pharmacology and Experimental Therapeutics %P 265-270 %V 211 %N 2 %U https://jpet.aspetjournals.org/content/jpet/211/2/265.full.pdf