1. M. E. Gertsenshtein and V. I. Pustovoit, Zh. Éksp. Teor. Fiz. 43, 605 (1962) [Sov. Phys. JETP 16, 433 (1963)].
2. R. W. P. Drever, G. M. Ford, J. Hough, et al., in Proceedings of 9th International Conference on General Relativity and Gravitation, Jena, 1980, Ed. by E. Schmutzer (VEB, Berlin, 1983), p. 265.
3. A. Abramovici, W. E. Althouse, R. W. P. Drever, et al., Science 256, 325 (1992).
4. V. M. Andriyakhin, A. G. Basiev, V. V. Lebedeva, and A. I. Odintsov, Radiotekh. Élektron. (Moscow) 13, 743 (1968).
5. Yu. V. Troitskii, Kvantovaya Élektron. (Moscow) 5, 1101 (1978).