Frainer, Deivis Elton Schlickmann, Fernando Roberto De-Oliveira, César Cavinato Cal Abad, and Maria Augusta Peduti Dal Molin Kiss. 2008. “Validity Evidences in t20 As an Approach to the Anaerobic Threshold in Young Soccer Players”. Journal of Physical Education 15 (2), 33-37. https://periodicos.uem.br/ojs/index.php/RevEducFis/article/view/3419.