Universidad de Zaragoza Repository

@article{Frago-Calvo:61874,
      author        = "Frago-Calvo, J.M. and Murillo, B. and García-González,
                       L. and Aibar, A. and Zaragoza, J.",
      title         = "{Physical activity levels during unstructured recess in
                       Spanish primary and secondary schools}",
      year          = "2017",
}