1. Real time electron density profiles from ionograms;Reinisch;Adv. Space Res.,1988
2. The Digisonde network and databasing;Reinisch;World Data Center A for Solar-Terrestrial Physics, Report UAG-104,1995
3. International Reference Ionosphere 1990;Bilitza;NSSDC/WDC-A-R&S 90-22,1990
4. Improving IRI 90 low latitude ionospheric specifications;Anderson,1995
5. The new portable Digisonde for vertical and oblique sounding;Reinisch,1992