Umer, Daniya, et al. “Bio-Electrical Impedence Plethysmography-Designing an Efficient Non-Invasive Electrode for Cardiac Rate Analysis”. International Journal of Endorsing Health Science Research, vol. 1, no. 1, July 2013, pp. 29-32, doi:10.29052/IJEHSR.v1.i1.2013.29-32.