Spanagel, R. Max Planck Institute of Psychiatry, Max Planck Society;
Shoaib, M. Max Planck Institute of Psychiatry, Max Planck Society;
Spanagel, R., & Shoaib, M. (1994). Involvement of mesolimbic k-opioid systems in the discriminative stimulus effects of morphine. Neuroscience, 63, 797-804.