We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleVoucher-based reinforcement of cocaine abstinence in treatment-resistant methadone patients: effects of reinforcement magnitude.AuthorsSilverman K; Chutuape MA; Bigelow GE; Stitzer MLPublicationPsychopharmacology, 1999, Vol 146, Issue 2, p128ISSN0033-3158Publication typearticleDOI10.1007/s002130051098