Vila, Jaime Luis, María Carmen Fernández, Joaquín Pegalajar, María Nieves Vera, María B. Sánchez, Isabel Ramírez, Elisabeth Ruiz-padial, Nieves Pérez, and Humbelina Robles. 2003. “A New Look at Cardiac Defense: Attention or Emotion?”. The Spanish Journal of Psychology 6, nº 1:: 60-78. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0303120060A