Onuiri E, Madu N, Adeagbo B, Johnson I, Awodele O. Design and construction of a microcontroller-based heartbeat monitoring device with display. IJET [Internet]. 2014 May 26 [cited 2024 May 2];3(2):279-8. Available from: https://www.sciencepubco.com/index.php/ijet/article/view/2342