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M J Picker,
R M Craft,
S S Negus,
K R Powell,
S R Mattox,
S R Jones,
B K Hargrove,
and L A Dykstra
Intermediate efficacy mu opioids: examination of their morphine-like stimulus effects and response rate-decreasing effects
in morphine-tolerant rats. J Pharmacol Exp Ther November 1992 263:668-681