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Children's in-school and out-of-school physical activity du..:

Beighle, Aaron ; Erwin, Heather ; Morgan, Charles F.
Research quarterly for exercise and sport.  83 (2012)  1 - p. 103-107 , 2012
Link: https://doi.org/10.1080/02701367.2012.10599830
Exemplar:  Zentrale:E03 z spo 201 j/784; Zentrale: Angebunden an z spo 201 j/784