ZAKARIA, MUHAMMAD AFIQ. Fingertip Heartbeat Monitor. Progress in Engineering Application and Technology, [S. l.], v. 2, n. 2, p. 472–487, 2021. Disponível em: https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/947. Acesso em: 8 apr. 2026.