Kiatcharoenpol, T., W. . Rattanapakdee, and S. . Klongboonjit. “Lean Production for Reducing Wastes in Convex Lens Production Process ”. International Journal of Membrane Science and Technology, vol. 10, no. 2, June 2023, pp. 1023-32, doi:10.15379/ijmst.v10i2.1408.