Feixas, Guillem and Luis Ángel Saúl. “The Multi-Center Dilemma Project: An Investigation on the Role of Cognitive Conflicts in Health”. The Spanish Journal of Psychology, vol. 7, vol. 7, no. 1, 2004, pp. 69-78, https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0404120069A.