Castellano, Julen, Roberto López del Campo, Ricardo Resta, and Ibai Errekagorri. “Use of the Playing Systems in Spanish Professional Football Leagues in Relation to Situational Variables”. Revista Iberoamericana de Ciencias de la Actividad Física y el Deporte 14, no. 1 (May 16, 2025): 424–443. Accessed December 12, 2025. https://www.revistas.uma.es/index.php/riccafd/article/view/21535.