1. Heer, C.V., “Interference of electromagnetic and matter waves in a nonpermanent gravitational field”, Bull. Am. Phys. Soc. 6, 58, Jan. 1961.
2. Rosenthal, A.H., “Regenerative circulatory multiple-beam interferometry for the study of light propagation effects” J. Opt. Soc. Am., 52, 10, pp. 1143–1148, Oct. 1962.
3. Macek, W.M., D.T.M. Davis, “Rotation rate sensing with traveling-wave ring lasers”, Appl. Phys. Lett. 2, 3, pp. 67–68, 1 Feb. 1963.
4. Bogdanov, A.D., “Laser gyroscopes”, NASA TT F-15, 641, June 1974.
5. Aronowitz, F., “The Laser Gyro”, Laser Applications, Monte Ross (Ed.), Volume 1, Academic Press, New York, 1971.