1. H. Mehrtash, R. Laing, V.J. Wirtz, Comparative analysis of essential medicines for cardiovascular diseases in countries of the WHO Eastern Mediterranean region. East. Mediterr. Health. J. 24(5), 427–434 (2018)
2. M.W. Arnaudin, J.J. Mintzes, Students’ alternative conceptions of the human circulatory system: A cross-age study. Sci. Educ. 69(5), 721–733 (1985)
3. A.J. Weinhaus, K.P. Roberts, Anatomy of the human heart, in Handbook of Cardiac Anatomy, Physiology, and Devices, 2nd edn., (2005), S. 59–85
4. Q. Mubarak, M.U. Akram, A. Shaukat, A. Ramazan, Quality Assessment and Classification of Heart Sounds Using PCG Signals. no. February, (2018), S. 1–11
5. N.K. Al-Qazzaz, I.F. Abdulazez, S.A. Ridha, Simulation recording of an ECG, PCG, and PPG for feature extractions. J. Al-Khwarizmi Eng. J. 10(4), 81–91 (2014)