Llopis Gimeno, J, and A Sancho Perez. “Functional Electrical Stimulation (FES). A Review Article”. Cuestiones de Fisioterapia 5, no. 1 (April 30, 1997): 57–64. Accessed October 22, 2024. http://cuestionesdefisioterapia.es/index.php/cf/article/view/584.