Labrador, Francisco J., Mónica Bernaldo de Quirós Aragón, and Fernando De Arce. “Evaluation of a Group Cue-Exposure Treatment for Opiate Addicts”. The Spanish Journal of Psychology, vol. 8, vol. 8, no. 2, 2005, pp. 229-37, https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0505220229A.