1. Opioid peptides;Hughes;Brit J Med,1983
2. Reflections on opioid peptides;Hughes,1984
3. Opioid peptide precursors and their genes;Numa,1984
4. Endogenous opioids: biology and function;Akil;Ann Rev Neurosci,1984
5. Opioid systems: anatomical, physiological and clinical perspective;Watson,1984