Unreinforced responding during limited access to heroin self-administration.

Cite this paper

@article{Cummins2008UnreinforcedRD, title={Unreinforced responding during limited access to heroin self-administration.}, author={Erin N Cummins and Francesco Leri}, journal={Pharmacology, biochemistry, and behavior}, year={2008}, volume={90 3}, pages={420-7} }