1. R. H. Page, M. C. Jurich, R. Reck, et al., J. Opt. Soc. Am. B 7, 1239 (1990).
2. J.-M. Nunzi, C. Fiorini, A.-C. Etile, et al., Pure Appl. Opt. 7, 141 (1998).
3. Integrated Optics, Ed. by T. Tamir (Springer-Verlag, Berlin, 1975; Mir, Moscow, 1978).
4. I. U. Primak and A. V. Tomov, Vestsi Nats. Akad. Navuk Belarusi, Ser. Fiz.-Mat. Navuk, No. 2, 97 (2001).
5. A. V. Khomchenko, A. B. Sotskii, A. A. Romanenko, et al., Pis’ma Zh. Tekh. Fiz. 28(11), 51 (2002) [Tech. Phys. Lett. 28, 467 (2002)].