Efficacy and versatility of voucher-based reinforcement in drug abuse treatment.

Author(s):  
Kenneth Silverman ◽  
Kenzie L. Preston ◽  
Maxine L. Stitzer ◽  
Charles R. Schuster
Author(s):  
Robert L. Hubbard ◽  
James J. Collins ◽  
J. Valley Rachal ◽  
Elizabeth R. Cavanaugh

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