1. Becker, A., Pant, M.: Android 2: Grundlagen und Programmierung. Dpunkt.Verlag GmbH (2010)
2. Borg, G.: Perceived exertion as an indicator of somatic stress. Scandinavian Journal of Rehabilitation Medicine 2, 92–98 (1970)
3. Busch, C., Litvina, A., Willemsen, D.: Kardiale telerehabilitation auf basis einer flexiblen plattform f’ur verteilte systeme - das osami-d projekt. e-Health, 218–221 (2009)
4. Buttussi, F., Chittaro, L., Nadalutti, D.: Bringing mobile guides and fitness activities together: a solution based on an embodied virtual trainer. In: Proceedings of the 8th conference on Human-computer interaction with mobile devices and services, MobileHCI 2006, pp. 29–36. ACM, New York (2006)
5. Crockford, D.: The application/json media type for javascript object notation (json). Tech. Rep. RFC 4627, IETF (September 2006)