β-CIT SPECT demonstrates blockade of 5HT-uptake sites by citalopram in the human brain in vivo. - Pirker,W.; Asenbaum,S.; Kasper,S.; Walter,H.; Angelberger,P.; Koch,G.; Pozzera,A.; Deecke,L.; Podreka,I.; Brücke,T. (J. Neural Transm., 1995)