Carrasco Sosa, S., M. Gaitán González, C. Yáñez Suarez, and R. González Camarena. “Constant Load Ergometer for Evaluation of Anaerobic Performance”. Revista Mexicana De Ingenieria Biomedica, vol. 10, no. 1, Oct. 1989, p. 12, http://rmib.mx/index.php/rmib/article/view/740.