1. Ch. Vassallo, J. Opt. Soc. Amer. A 5, 1918 (1988).
2. P. C. Kendall, D. A. Roberts, P. N. Robson, et al., IEE Proc. Part. J: Optoelectronics 140, 49 (1993).
3. M. Reed, T. M. Benson, P. C. Kendall, and P. Sewell, IEE Proc. Part. J: Optoelectronics 143, 96 (1996).
4. R. J. Hansperger, Integral Optics (Springer-Verlag, Berlin, 1984; Mir, Moscow, 1985).
5. T. Okosi, K. Okamoto, M. Otsu, H. Nisihara, K. Kuma, and K. Hatate, Fiber-Optic Sensors (Energoatomizdat, Leningrad, 1990) [in Russian].