Mohamad, E., A. Ishak, and H. Arep. “Promoting Sustainable Wastewater Treatment Operations: The Role of Lean Practices and Lean Six Sigma Enablers”. Journal of Mechanical Engineering and Sciences, vol. 18, no. 3, Sept. 2024, pp. 10116-2, doi:10.15282/jmes.18.3.2024.2.0799.