@article {9637,
	title = {Cocaine seeking over extended withdrawal periods in rats: Time dependent increases of responding induced by heroin priming over the first 3 months},
	journal = {Psychopharmacology},
	year = {2004},
	pages = {109-114},
	doi = {10.1007/s00213-004-1861-3},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/15071720},
	author = {Lin Lu and Jack Dempsey}
}
