A comprehensive system for detection of flammable and toxic gases using IoT. Periodicals of Engineering and Natural Sciences, [S. l.], v. 9, n. 2, p. 702–711, 2021. DOI: 10.21533/pen.v9.i2.776. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/776. Acesso em: 25 jul. 2026.