Design and Development of a Smart Heart Rate, SpO₂, Location Tracking and Emergency Alert Device. International Journal of Scientific Research in Science and Technology, [S. l.], v. 13, n. 2, p. 462–469, 2026. Disponível em: https://mail.ijsrst.com/index.php/home/article/view/IJSRST2613318. Acesso em: 29 apr. 2026.