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Self-administration of cocaine and heroin combinations by rhesus monkeys responding under a progressive-ratio schedule

Substance AbuseBehavioral SciencesSubstance UsePsychoactive DrugBehavioral NeuroscienceAddictionRhesus MonkeysBehavioral PharmacologyBehavioral AddictionSocial SciencesHeroin CombinationsSubstance AddictionMedicinePsychologyProgressive-ratio Schedule