Pérez-García AM, Bermúdez J, Sanjuán P, Rueda B, Sánchez-Elvira-Paniagua Ángeles. Perceived competence and level of task difficulty: Performance and heart rate reactivity. Accion psicol. [Internet]. 2012Jul.9 [cited 2023May29];1(1):31-44. Available from: https://revistas.uned.es/index.php/accionpsicologica/article/view/540