1. “ECG timeline - History of the electrocardiogram”, Ecglibrary.com, 2016. [Online]. Available: http://www.ecglibrary.com/ecghist.html. [Accessed: 10-May-2016].
2. “Cardiovascular Lab: Electrocardiogram: Setup”, Medicine.mcgill.ca, 2016. [Online]. Available: http://www.medicine.mcgill.ca/physio/vlab/cardio/setup.htm. [Accessed: 10-May-2016].
3. “Adaptive Noise Removal of ECG Signal Based On Ensemble Empirical Mode Decomposition”, 2016. [Online].Available:applications/adaptive-noise-removal-of-ecg-signal-based-on-ensemble-empirical-mode-decomposition. [Accessed: 8-June-2016].
4. PCbasedpatientmonitoringsystem, DevelopmentofECGamplifier”,Library.utem.edu.my, 2016. [Online]. Available:http://library.utem.edu.my/index2.php?option=com_docman&task=doc_view&gid=817&Ite mid=208.[Accessed: 10-Apr-2016].