“THEORETICAL FOUNDATIONS OF TRIATHLON AND THE SYSTEM OF MESOCYCLES IN THE TRAINING PROCESS”, Wor. Bull.of Phy. Edu. & Spo. Sci., vol. 1, no. 1, pp. 74–78, Oct. 2025, Accessed: Nov. 12, 2025. [Online]. Available: https://worldbulletin.org/index.php/2/article/view/43