Carreras Alabau, A., J. A. Carrobles Isabel, and C. Almendros Rodríguez. “Perceived Stress Related to Methadone Withdrawal”. Psicothema, vol. 28, no. Número 3, Dec. 2016, pp. 235-40, http://156.35.33.188/index.php/PST/article/view/11284.