Álvarez Bogantes, Carlos, et al. “DETERMINATION OF PHYSICAL ACTIVITY DURING SCHOOL RECESS COMBINING MEASUREMENTS OF PHYSICAL ACTIVITY AND CHILDREN’S PERSPECTIVE”. MHSalud: Revista En Ciencias Del Movimiento Humano Y Salud, vol. 14, no. 2, Jan. 2018, pp. 36-48, https://doi.org/10.15359/mhs.14-2.4.