Citation: B. Kest et al., THE COMPETITIVE PHA-AMINO-3-HYDROXY-5-METHYLISOXAZOLE-4-PROPIONATE RECEPTOR ANTAGONIST LY293558 ATTENUATES AND REVERSES ANALGESIC TOLERANCETO MORPHINE BUT NOT TO DELTA-OPIOID OR KAPPA-OPIOID, The Journal of pharmacology and experimental therapeutics, 283(3), 1997, pp. 1249-1255