Achawakorn, K., T. Jearsiripongkul, and K. Fanchaeng. “The Effect of HDD Pivot Bearing Assembly Process on Actuator Arm Modal Frequency”. Engineering and Applied Science Research, vol. 40, no. 1, May 2013, pp. 29-33, https://ph01.tci-thaijo.org/index.php/easr/article/view/8564.