ISA, M. I. M.; NGATIMAN, N.; AHMAD, M. .; SAAD, S. .; NUAWI, M. . Monitoring Valve and Spark Plug Failures using Z-Freq Statistical Analysis. Journal of Acoustics and Vibration Research, [S. l.], v. 3, n. 1, p. 14–21, 2025. Disponível em: https://journal.svam.my/index.php/javr/article/view/39. Acesso em: 22 oct. 2025.