1. T. TAMIR (ed.), ‘Integrated Optics’ (Springer, Berlin, Heidelberg, New York, 1975).
2. D. MARCUSE, ‘Theory of Dielectric Optical Waveguides’ (Academic, New York, 1974).
3. E. Popov and L. Mashev,Opt. Acta (submitted).
4. V. A. SYCHUGOV and I. CTIROKY,Kvant. Elektr. 9 (1982) 634.
5. V. A. SYCHUGOV and A. V. TISCHENKO,ibid. 9 (1982) 1451.