1. L. Foucault, “Demonstration physique du mouvement de la Terre au moyen du pendule,” Com. Rend. Acad. Sci. Paris 32 (5), 135–138 (1851).
2. Onnes H. Kamerlingh, “Nieuwe bewijzen voor de aswenteling der aarde,” Ph. D. Disertation (Groningen, Netherlands, 1879).
3. W. H. Quick, “Theory of vibrating string as an angular motion sensor,” Trans. ASME. Ser. E. J. Appl. Mech. 31 (3), 523–534 (1964).
4. J. C. Stiles, “Vibrating ring gyro,” U.S. Patent. No. 3,924,475 (1975).
5. E. J. Loper and D. D. Lynch, Sonic Gyro Fabrication and Testing, Report R77-64 (Delco Electronics Division, 1977).