University of Minnesota. Department of PsychiatryMeisch, Richard A.Stark, Linda J.2013-06-242013-06-241977-10-03https://hdl.handle.net/11299/151677en-USEtonitazene as a Reinforcer via the Oral Route for Rats: Effects of Etonitazene Concentration and Food Intake on Etonitazene-Reinforced BehaviorWorking Paper