| Cowan, A; Zhu, X Z; Mosberg, H I et al. (1988) Direct dependence studies in rats with agents selective for different types of opioid receptor. J Pharmacol Exp Ther 246:950-5 |
| Cowan, A (1988) Behavioral effects of bombesin. Ann N Y Acad Sci 547:204-9 |
| Gmerek, D E; Cowan, A (1988) Role of opioid receptors in bombesin-induced grooming. Ann N Y Acad Sci 525:291-300 |
| Smith, J E; Dworkin, S I (1986) Neurobiological substrates of drug self-administration. NIDA Res Monogr 71:127-45 |
| Cowan, A; Khunawat, P; Zhu, X Z et al. (1985) Effects of bombesin on behavior. Life Sci 37:135-45 |
