1. A. Sommerfeld, Math. Ann. 47, 317 (1896).
2. E. N. Vasil’ev, Excitation of Bodies of Revolution (Radio iSvyaz’, Moscow, 1987) [in Russian].
3. E. I. Nefedov and A. T. Fialkovskii, Strip Transmission Lines (Nauka, Moscow, 1980) [in Russian].
4. M. Leontovich and M. Levin, Z. Tekh. Fiz. 14, 481 (1944).
5. T. B. A. Senior, Proc. R. Soc. London, Ser. A 213 (1115), 436 (1952).