Bexelius, C., Löf, M., Sandin, S., Trolle Lagerros, Y., Forsum, E., & Litton, J. (2010). Measures of Physical Activity Using Cell Phones: Validation Using Criterion Methods. Gunther Eysenbach.

Bexelius, Christin, Marie Löf, Sven Sandin, Ylva Trolle Lagerros, Elisabet Forsum, ja Jan-Eric Litton. Measures of Physical Activity Using Cell Phones: Validation Using Criterion Methods. Gunther Eysenbach, 2010.

Bexelius, Christin, et al. Measures of Physical Activity Using Cell Phones: Validation Using Criterion Methods. Gunther Eysenbach, 2010.