Navarro, E., D. Chorro, G. Torres, A. Navandar, J. Rueda, and S. Veiga. “Electromyographic Activity of Quadriceps and Hamstrings of a Professional Football Team During Bulgarian Squat and Lunge Exercises”. Journal of Human Sport and Exercise, vol. 16, no. 3, July 2021, pp. 581-94, doi:10.14198/jhse.2021.163.08.