Dwoskin, L. ., Crooks, P. ., Teng, L. ., Green, T. ., & Bardo, M. . (1999). Acute and chronic effects of nornicotine on locomotor activity in rats: altered response to nicotine. Psychopharmacology, 145(4), 442-51. https://doi.org/10.1007/s002130051079

Klebaur, J. ., & Bardo, M. . (1999). The effects of anxiolytic drugs on novelty-induced place preference. Behavioural Brain Research, 101(1), 51-7. https://doi.org/10.1016/s0166-4328(98)00145-4

Klebaur, J. ., & Bardo, M. . (1999). Individual differences in novelty seeking on the playground maze predict amphetamine conditioned place preference. Pharmacology, Biochemistry, and Behavior, 63(1), 131-6. https://doi.org/10.1016/s0091-3057(98)00258-5

Bardo, M. ., Valone, J. ., & Bevins, R. . (1999). Locomotion and conditioned place preference produced by acute intravenous amphetamine: role of dopamine receptors and individual differences in amphetamine self-administration. Psychopharmacology, 143(1), 39-46. https://doi.org/10.1007/s002130050917

Segar, T. ., Klebaur, J. ., Bardo, M. ., & Barron, S. . (1999). Acquisition of a fixed ratio schedule in adult male rats neonatally exposed to ethanol and/or cocaine. Alcoholism, Clinical and Experimental Research, 23(1), 7-11.

Randall, C. ., Kraemer, P. ., & Bardo, M. . (1998). Morphine-induced conditioned place preference in preweanling and adult rats. Pharmacology, Biochemistry, and Behavior, 60(1), 217-22. https://doi.org/10.1016/s0091-3057(97)00585-6

Valone, J. ., Randall, C. ., Kraemer, P. ., & Bardo, M. . (1998). Olfactory cues and morphine-induced conditioned analgesia in rats. Pharmacology, Biochemistry, and Behavior, 60(1), 115-8. https://doi.org/10.1016/s0091-3057(97)00554-6

Bevins, R. ., & Bardo, M. . (1998). Morphine-conditioned changes in locomotor activity: role of the conditioned stimulus. Experimental and Clinical Psychopharmacology, 6(2), 131-8. https://doi.org/10.1037//1064-1297.6.2.131

Bardo, M. . Neuropharmacological mechanisms of drug reward: beyond dopamine in the nucleus accumbens. Critical Reviews in Neurobiology, 12(1-2), 37-67. https://doi.org/10.1615/critrevneurobiol.v12.i1-2.30 (Original work published 1998)

Rebec, G. ., , Guerra, C. ., & Bardo, M. . (1997). Regional and temporal differences in real-time dopamine efflux in the nucleus accumbens during free-choice novelty. Brain Research, 776(1-2), 61-7. https://doi.org/10.1016/s0006-8993(97)01004-4 (Original work published 1997)