1. Marcuvitz, N.: Waveguide handbook, (McGraw-Hill 1951)
2. Lewin, L.: Advanced theory of waveguides, (Iliffe 1951)
3. Collin, R.E.: Field theory of guided waves, (McGraw-Hill 1960)
4. Lewin, L.: ‘The use of singular integral equations in the solution of waveguide problems’, Young, L., Advances in microwaves, (Academic Press 1966),1, p. 211