Neisewander, J. ., Nonneman, A. ., McDougall, S. ., & Bardo, M. . (1969). Up-regulation of opiate receptors following chronic naloxone treatment in aged rats. Neurobiology of Aging, 10(1), 55-8. https://doi.org/10.1016/s0197-4580(89)80011-9 (Original work published 1969)

Neisewander, J. ., Rowlett, J. ., Nonneman, A. ., & Bardo, M. . Up-regulation of opiate receptors following chronic naltrexone treatment in mature and aged male and female rats. Progress in Clinical and Biological Research, 292, 471-6. (Original work published 1989)

Bardo, M. ., Neisewander, J. ., & Ennis, R. . (1988). Chronic treatment with naltrexone enhances morphine-stimulated dopamine neurotransmission: neurochemical and behavioral evidence. Neuropharmacology, 27(11), 1103-9. https://doi.org/10.1016/0028-3908(88)90004-4

Bardo, M. ., & Neisewander, J. . (1987). Chronic naltrexone supersensitizes the reinforcing and locomotor-activating effects of morphine. Pharmacology, Biochemistry, and Behavior, 28(2), 267-73. https://doi.org/10.1016/0091-3057(87)90224-3

Neisewander, J. ., & Bardo, M. . Expression of morphine-conditioned hyperactivity is attenuated by naloxone and pimozide. Psychopharmacology, 93(3), 314-9. https://doi.org/10.1007/BF00187249 (Original work published 1987)

Bardo, M. ., & Neisewander, J. . (1986). Single-trial conditioned place preference using intravenous morphine. Pharmacology, Biochemistry, and Behavior, 25(5), 1101-5. https://doi.org/10.1016/0091-3057(86)90092-4

Bardo, M. ., & Hughes, R. . (1981). Single-dose tolerance to morphine-induced analgesic and hypoactive effects in infant rats. Developmental Psychobiology, 14(5), 415-23. https://doi.org/10.1002/dev.420140504

Bardo, M. ., Bhatnagar, R. ., & Gebhart, G. . (1982). Differential effects of chronic morphine and naloxone on opiate receptors, monoamines, and morphine-induced behaviors in preweanling rats. Brain Research, 256(2), 139-47. https://doi.org/10.1016/0165-3806(82)90037-2

Bardo, M. ., & Gunion, M. . (1982). Within- and between-subjects differences in the effect of morphine in mice. Psychological Reports, 50(2), 567-73. https://doi.org/10.2466/pr0.1982.50.2.567

Bardo, M. ., Bhatnagar, R. ., Gebhart, G. ., & Hughes, R. . (1982). Opiate receptor development in midbrain and forebrain of posthatch chicks. Brain Research, 255(4), 668-73. https://doi.org/10.1016/0165-3806(82)90064-5