Achawakorn, Khosak, Thira Jearsiripongkul, and Krairoek Fanchaeng. 2013. “The Effect of HDD Pivot Bearing Assembly Process on Actuator Arm Modal Frequency”. Engineering and Applied Science Research 40 (1):29-33. https://ph01.tci-thaijo.org/index.php/easr/article/view/8564.