David G Morfitt

'Invert', A Computer Program For Obtaining D-Region Electron Density Profiles from VLF Reflection Coefficients.

David G Morfitt, Charles H Shellman, 1977 .

'MODESRCH', An Improved Computer Program for Obtaining ELF/VLF/LF Mode Constants in an Earth-Ionosphere Waveguide

David G Morfitt, Charles H Shellman, C. H. Shellman, 1976 .