1. VON Zur Theorie der Bessel'schen Funktionen;LOMMEL;Math. Ann.,1879
2. Reflection of electromagnetic waves at ionized media with variable conductivity and dielectric constant;ELIAS;Proc. IRE,1931
3. Propagation over plane earth through an exponential atmosphere;GERKS;Radio Science, J. Res. NBS/USNC-URSI,1964
4. Theorie der Beugung Elektromagnetischer We lien;FRANZ,1957