AKPAN, W.A.; NYAUDO, I.I.; OBOT, O. W. Design and Production of Heartbeat Counter for Medical Application. Engineering And Technology Journal, [S. l.], v. 9, n. 3, p. 3623–3637, 2024. DOI: 10.47191/etj/v9i03.10. Disponível em: http://everant.org/index.php/etj/article/view/1235. Acesso em: 9 may. 2024.