Mahmood, A. F. G., Z. M. Abdulrazzaq Hasan, Z. K. Hashim Hamza, and F. F. J. Abdalzahra. “Design and Construction of Heart Beat Sensor Using Arduino”. Journal of Science in Medicine and Life, vol. 3, no. 1, Jan. 2025, pp. 121-8, https://journals.proindex.uz/index.php/JSML/article/view/2038.