Leetrakool, Athiratch, Teangtaum Sittichantasen, Asada Wannakayont, and Nikom Lonkunthos. 2020. “STUDY OF THE CAUSES OF PROBLEM AND THE NEEDS OF KNOWING THE REDUCED LIFE TIME OF BEARING”. Journal of MCU Nakhondhat 7 (11). Nakhon Si Thammarat, Thailand:34-46. https://so03.tci-thaijo.org/index.php/JMND/article/view/248263.