Ruzi, I. I. ., Ishak, A. R. ., Abdullah, M. A. ., Zain, N. N. M. ., Tualeka, A. R. . and Aziz, M. Y. (2023) “Assessment of Heavy Metal Concentrations in Penang, Malaysia’s Wastewater Treatment Plants: A Wastewater-Based Epidemiology Approach”, Trends in Sciences. Nakhon Si Thammarat, Thailand, 20(5), p. 6523. doi: 10.48048/tis.2023.6523.