author = { Sagvolden, Terje AND Sl�tta, Knut AND Arntzen, Erik },

title = { Low doses of methylphenidate (Ritalin) may alter the delay-of-reinforcement gradient },

publisher = {Springer Science and Business Media LLC},

isbn = {0033-3158},

isbn = {1432-2072},

keywords = { Pharmacology },

year = {1988},

url = { http://slubdd.de/katalog?TN_libero_mab2 }