Ivaldi, Marco, Andrea Ciavattini, and Cugliari Giovanni. “Heart Rate Analysis During Very Deep Dives in Flooded Caves: Single Case Study”. International Journal of Physical Education, Fitness and Sports 9, no. 3 (August 30, 2020): 09–17. Accessed May 3, 2024. https://ijpefs.org/index.php/ijpefs/article/view/313.