K. Sirikasemsuk, T. Kiatcharoenpol, H. Waiyaroop, T. Kullawong, and L. Treeranurat, “A Study of Factors Affecting The Screw Spacing of Spoilers in Hard Disk Drives for Productivity Increase Using Multiple Regression Analysis”, NUEJ, vol. 16, no. 1, pp. 167–187, Jun. 2021.