1. I. Porat, E. Netzer, J. Rosenberg, Y. Netzer, A two axis rate gyroscope, in, EP Patent 0,274,004, 1992.
2. M. Sakamoto, Two-phase permanent-magnet electric rotating machine, in, United States Patent 5854526, 1998.
3. Fault diagnosis of rotating machinery;Edwards;Shock and Vibration Digest,1998
4. On the stability of rotation of a rotor with rotationally unsymmetric inertia and stiffness properties;Crandall;Journal of Applied Mechanics,1961
5. Dynamic behaviour of the Laval rotor with a transverse crack;Gasch;Mechanical Systems and Signal Processing,2008