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IP address: 3.82.58.213
Time: 2024-03-29T15:28:05Z
URL: http://scholar.google.com/scholar_lookup?title=Unidirectional+analgesic+cross-tolerance+between+morphine+and+levorphanol+in+the+rat&year=1988&author=Moulin&journal=Pain&volume=33&issue=2&pages=233-239&doi=10.1016%2F0304-3959%2888%2990095-4&pmid=2837716