1. M. Moisan, J. Hurbert, J. Margot, and Z. Zakrzewski, in Advanced Technologies Based on Wave and Beam Generated Plasmas, Ed. by H. Schlüter and A. Shivarova (Kluwer Academic, Amsterdam, 1999), p. 1.
2. A. N. Kondratenko, Plasma Waveguides (Atomizdat, Moscow, 1976) [in Russian].
3. I. Zhelyazkov and V. Atanassov, Phys. Rep. 255, 79 (1995).
4. L. Stenflo, Phys. Scr. T63, 59 (1996).
5. N. A. Azarenkov and K. N. Ostrikov, Phys. Rep. 308, 333 (1999).