Bardo, M. ., Gehrke, B. ., Shortridge, B. ., & Rauhut, A. . (2003). Effects of beta-funaltrexamine and naloxonazine on single-trial morphine-conditioned place preference and locomotor activity. Pharmacology, Biochemistry, and Behavior, 74(3), 617-22. https://doi.org/10.1016/s0091-3057(02)01049-3