Yeol Bae, Tae, and Myung Ho Bae. 2017. “The strength analysis of a complex planetary gear system for tunnel boring machine reducer”. RMUTSB ACADEMIC JOURNAL 5 (2). Phra Nakorn Sri Ayutthaya:179-88. https://li01.tci-thaijo.org/index.php/rmutsb-sci/article/view/105359.