Bohloul Habibi Asl, Reza Abdelalipur, and Mehrdad Shahidi. “Effects of Caffeine on Morphine Tolerance and Analgesia in Mice: Caffeine Attenuates Morphine Effects”. Iranian Journal of Pharmaceutical Sciences 7, no. 2 (April 1, 2011): 99–106. Accessed February 16, 2025. https://ojs2.sbmu.ac.ir/index.php/ijps/article/view/41345.