Jiménez Rejano, J J, et al. “EFFECTIVENESS OF THE ANALGESIC TENS IN FUNCTION OF THE USED PARAMETERS. A CONTROVERSIAL TOPIC”. Cuestiones De Fisioterapia, vol. 37, no. 3, June 2008, pp. 170-9, http://cuestionesdefisioterapia.es/index.php/cf/article/view/316.