1. Selective blockage of delta opioid receptors prevents the development of morphine tolerance in mice;Abelhamid;J. Pharmac. Exp. Ther.,1991
2. Acetylcholinesterase inhibition and morphine effects in morphine tolerant and dependent mice;Bhärgava;J. Pharmac. Exp. Ther.,1972
3. Acute physical dependence in man: effects of naloxone after morphine exposure;Bickel;J. Pharmac. Exp. Ther.,1988
4. Potentiation of morphine analgesia by muscimol;Biggio;Neuropharmac.,1977
5. δ-Aminolaevulinic acid is a potent agonist for GABA autoreceptor;Brennan;Nature,1979