1. The completeness of the eigenfunctions of certain classes of non-selfconjugate linear operators;Keldysh;Usp. Mat. Nauk,1971
2. Investigation of the dispersion equations of the spectral method;Il'Inskii;Dokl. Akad. Nauk SSSR,1983
3. The Galerkin method in non-selfconjugate boundary-value problems of the theory of waveguides;Modenov;Zh. vychisl. Mat. mat. Fiz.,1987
4. The semi-inversion method in problems of the diffraction of waves by branched plane irregular waveguides;Il'Inskii;Dokl. Akad. Nauk,1987