Abdul Ghaffar, Zulkifli, et al. “Box-Behnken Design Application to Optimize Swirl Effervescent Droplet Mean Diameter”. Journal of Mechanical Engineering and Sciences, vol. 18, no. 4, Dec. 2024, pp. 10233-46, https://doi.org/10.15282/jmes.18.4.2024.2.0808.