D. McMinn, N. M. Oreskovic, M. J. Aitkenhead, D. W. Johnston, S. Murtagh, and D. A. Rowe, “The physical environment and health-enhancing activity during the school commute: global positioning system, geographical information systems and accelerometry”, Geospat Health, vol. 8, no. 2, pp. 569–572, May 2014.