1. Pulse phone: smart-phone app tracks heart rate. http://www.technologyreview.com/news/425758/smart-phone-app-tracks-heart-rate/ . Accessed May 2013.
2. Weka machine learning toolkit. http://www.cs.waikato.ac.nz/ml/index.html . Accessed May 2013.
3. Zeo sleep manager (2012). http://www.myzeo.com/sleep/ . Accessed May 2013.
4. Sleepcycle (2013). A bio-alarmclock. http://www.sleepcycle.com/ . Accessed May 2013.
5. Mohd Fikri Azli bin Abdullah, Ali Fahmi Perwira Negara, Shosel Sayeed, Deok-Jai Choi, Kalaiarasi Sonai Muthu (2012). Classification algorithms in human activity recognition using smartphones. World Academy of Science, Engineering and Technology, 68, 422–430.