1. Handbook of Mathematical Functions;ABRAMOWITZ,1964
2. Terrestrial Radio Waves;BREMMER,1949
3. Propagation of the low-frequency radio signal;JOHLER;Proc. IRE,1962
4. Radio pulse propagation by a reflection process in the lower ionosphere;JOHLER;Radio Propagation,1963
5. Concerning limitations and further corrections to geometric-optical theory for L.F., V.L.F. propagation between the ionosphere and the ground;JOHLER;Radio Sci.,1964