2. "Presynaptic opiate receptor - mediated inhibition of endogenous norepinephrine and dopamine -b- hydroxylase release in the cat spleen, independent of the presynaptic alpha adrenoceptors" by Ronald R. Gladdis and Walter R. Dixon

2. "Presynaptic opiate receptor - mediated inhibition of endogenous norepinephrine and dopamine -b- hydroxylase release in the cat spleen, independent of the presynaptic alpha adrenoceptors" by Ronald R. Gladdis and Walter R. Dixon, Box: 17, Folder: 3. Personal Papers of Walter R. Dixon, PP 401. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/255546 Accessed December 25, 2025.