1. N. Khadilkar, Modeling and validation of ultrasonic motor, M.S. Thesis, Michigan University, 2004.
2. Contact mechanics of piezoelectric ultrasonic motors;Wallaschek;Smart Materials and Structures,1998
3. Estimation of the tangential stresses in the stator/rotor contact of traveling wave ultrasonic motors using viscoelastic foundation models;Cao;Contact Mechanics II Computational Techniques,1995
4. Modelling and analysis of dynamic contact problems in travelling wave ultrasonic motors;Cao,1995
5. The effect of tangential elasticity of the friction layer between stator and rotor in traveling wave ultrasonic motors;Storck;International Journal of Non-Linear Mechanics,2003