Pereira Brun , M, A Caña Pino, and M D Apolo Arenas. 2018. “POSITIVE EXPIRATORY PRESSURE TECHNIQUES (PEP) IN CYSTIC FIBROSIS. BIBLIOGRAPHIC REVIEW”. Cuestiones De Fisioterapia 47 (2): 131-41. https://cuestionesdefisioterapia.com/index.php/es/article/view/174.