CLAIRE MILLS; RACHEL BURNETT. An Investigation into Physical Activity Levels in Primary School Playgrounds. Sports and Exercise Medicine , [S. l.], v. 3, n. 2, p. 30–39, 2017. DOI: 10.17140/SEMOJ-3-145. Disponível em: https://openventio.us/index.php/SEM/article/view/867. Acesso em: 12 nov. 2026.