1. (1) Office for research and experiments of the international union of railways (ORE), Tests on Passenger Coaches to Determine the Maximum Permissible Out-of-balance of Wheels, Question B79 Problems Connected with the Design, Assembly and Maintenance of Trailer Stock Wheelsets, Report No.6(1967), pp.1-74.
2. (2) Koyanagi, S., The Method of Preventing Longitudinal Vibrations of a Two-Axled Bogie Vehicle, Railway Technical Research Report (in Japanese), No.1186(1981), pp.1-31.
3. (3) Matsui, N., Theoretical Analysis of the Railway Vehicle Vibrations Caused by the Wheelset Mass -Imbalance, Tokyu-car corp. Technical Review (in Japanese), No.36(1983), pp.2-12.
4. (4) The Japan Society of Mechanical Engineers, Railway Vehicle Dynamics - The Latest Bogie Technologies - (in Japanese), (1996), pp.15-20, 49-51, Denkisyakenkyu-kai.
5. (5) The Research Committee for High-speed Railway Wheelsets, Railway Wheelsets (in Japanese), (2008), pp.210-213, Maruzen Co., Ltd..