Al-Qazzaz, N., Abdulazez, I. and Ridha, S. (2017) “Simulation Recording of an ECG, PCG, and PPG for Feature Extractions”, Al-Khwarizmi Engineering Journal, 10(4), pp. 81-91. Available at: http://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/208 (Accessed: 29November2019).