1. N. Marinescu and R.E. Nistor: Rev. Roum. Phys.30 (1985) 579.
2. N. Marcuvitz:Waveguide Handbook, Mc Graw-Hill, New York, 1951.
3. G. Matthaei, L. Young, and E.M.T. Jones:Microwave filters, impedance-matching network, and coupling structure, New York, Mc Graw-Hill, 1951.
4. M.A. Shapiro, W.J. Brown, I. Mastovsky, J.R. Sirigiri, and R.J. Temkin: Phys. Rev., ST Accel. Beams4 (2001) 042001.
5. S.B. Conn: Proc. IRE40 (1972) 696.