J. M. Grijalva Rosero, M. J. Herrera Simbaña, H. P. López Fierro, N. F. Ramon Calvache, S. R. Ullaguari Flores, and A. R. Tamayo Benavides, “Periodization in extracurricular sports training: improvement in physical and technical performance”, Mentor, vol. 5, no. 1, pp. 127–136, Mar. 2026.