Fly-Ash-Based Zeolite Beta: A Low-Cost Material for High- Sensitivity Gas Sensors. Indo-American Journal of Mechanical Engineering, [S. l.], v. 9, n. 3, p. 23=30, 2020. Disponível em: https://iajme.com/index.php/iajme/article/view/128. Acesso em: 23 oct. 2026.