Contingency management is efficacious for cocaine abusers with prior treatment attempts
Experimental and Clinical Psychopharmacology (2008) - Comment
pubmed: 19086775  doi: 10.1037/a0014042  issn: 1064-1297  issn: 1936-2293 

Carla J. Rash, Sheila M. Alessi, Nancy M. Petry