1. A. S. Ilinsky and Yu. G. Smirnov, Electromagnetic Wave Diffraction by Conducting Screens (Radiotekhnika, Moscow, 1996; VSP, Utrecht, 1998).
2. A. Buffa and S. H. Christiansen, Numerische Mathe-matik 94 (2), 229 (2003).
3. Yu. G. Smirnov, M. Yu. Medvedik, and M. A. Maksi-mova, Izv. Vyssh. Uchebn. Zaved., Povolzhskii Region. Fiz. Mat. Nauki, No. 4, 59 (2012).
4. M. Yu. Medvedik, Vychisl. Metody Program. 13 (1), 87 (2012).
5. I. Hänninen, M. Taskinen, and J. Sarvas, Prog. Electromagn. Res., No. 63, 243 (2006).