1[1]Maldonado R, Dauge V, Callebert J, et al. Comparison of selective and complete inhibitors of enkephalin-degrading enzymes on morphine withdrawal syndrome[J]. Eur J Pharmacol, 1989, 165:199.
2[2]Yu W, Hao JX, Xu XJ, et al. The development of morphine tolerance and dependence in rats with chronic pain[J]. Brain Research, 1997,756: 141.
3[3]Fredholm BB, Vemet L. Morphine increases depolarization induced purine release from rat cortical slicos[J]. Acta Physiol Scand, 1978,104: 502.
4[4]Poon A, Sawynok J. Antinociception by adenosine analogs and adenosine kinase inhibitor: dependence on formalin concentration[J]. Eur J Pharmacol, 1995, 286: 177.
5[5]Agteresch HJ, Dagnelie PC, van den Berg JW, et al. Adenosine triphosphate: established and potential clinical applications[J]. Drags, 1999,58(2):218.