1. T. Yano, M. Kaneko and M. Sonoda, Development of a synchronous motor with three degrees of freedom, Theory and Practice of Robots and Manipulators, Springer-Verlag (1995) 275–280.
2. T. Yano, T. Suzuki, M. Sonoda and M. Kaneko, Basic characteristics of the developed spherical stepping motor, Proc. of International Conference on Intelligent Robots and Systems, kyongyu, Korea (3) (1999) 1393–1398.
3. T. Yano and T. Suzuki, Basic characteristics of a small spherical stepping motor, Proc. of International Conference on Intelligent Robots and Systems, Lausanne, Switzerland (3) (2002) 1980–1985.
4. T. Yano, T. Takatsuji, S. Osawa, Y. Motomura, T. Itabe and T. Suzuki, Development of a Spherical Motor Type Laser Tracker for the Portable 3D Position Measurement System, Proc. of International Conference on Linear Drives for Industrial Applications, Awaji, Japan (2005) 254–257.
5. T. Yano, Proposal of polyhedron based spherical stepping motor, Proc. of Symposium on Power Electronics, Electrical Drives, Automation and Motion (Speedam08), Ischia, Italy (2008) 1433–1438.