1. Noise control of heart by means of a smartphone;Aliev,2012
2. www.en.wikipedia.org/wiki/Holter_monitor.
3. www.ebneuro.biz/en/cardiology/ecg/easy-ecg-mobile.
4. www.ericsson.com/hr/ict_solutions/e-health/emh/index.shtml.
5. Information technology in bio- and medical informatics;Böhm,2011