1. Martin WR, Eades CG, Thompson JA, Huppler RE, Gilbert PE. The effects of morphine-and nalorphine-like drugs in the nondependent and morphine-dependent chronic spinal dog. J Pharmacol Exp Ther 1976; 197: 517–532.
2. Walker JM, Bowen WD, Walker FO, Matsumoto RR, De Costa B, Rice KC. Sigma receptors: biology and function. Pharmacol Rev 1990; 42: 355–402.
3. DeCosta BR, He XS. Structure-activity relationships and evolution of sigma receptor ligands (1976-present). In: Itzhak, Y., ed. Sigma Receptors. Academic, San Diego, CA, 1994, pp. 45–111.
4. Matsuno K, Senda T, Matsunaga K, Mita S. Ameliorating effects of 6 receptor ligands on the impairment of passive avoidance tasks in mice: involvement in the central acetylcholinergic system. Eur J Pharmacol 1994; 261: 43–51.
5. Maurice T, Hiramatsu M, Itoh J, Kameyama T, Hasegawa T, Nabeshima T. Behavioral evidence for a modulating role of a ligands in memory processes. I. Attenuation of dizocilpine (MK-801)-induced amnesia. Brain Res 1994; 647: 44–56.