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K.-F. Shen and S. M. Crain, “Ultra-Low-Doses of Naltrexone or Etorphine Increase Morphine’s Antinociceptive Potency and Attenuate Tolerance/Dependence in Mice,” Brain Research, Vol. 757, No. 2, 1997, pp. 176-190. http://dx.doi.org/10.1016/S0006-8993(97)00197-2

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