1. G. Nestorov,Aeronomical characteristics of D-region and energetic spectra of the ionizing radiation of October 30, 1969, Geomagn. Aeronom.X (1970), 1507 (in Russian).
2. A. P. Mitra andD. K. Chakrabarty,Models of lower ionospheric electron density profiles, Space Research, XI (Akad.-Verlag, Berlin 1971), p. 1013.
3. C. F. Sechrist, Jr.,Interpretation of D-region electron densities, Radio Sci.5 (1970), 663.
4. J. Taubenheim, G. Entzian, R. Knuth andK.-H. Ohle,On the information content of ionospheric solar flare effects observations. II. Some model considerations on the interpretation of solar flare effects in the ionosphere, J. Atmosph. Terr. Phys.36 (1974), 525.
5. J. Laštovička, Dissertation, Geophysical Inst. Czech. Acad. Sci., Praha 1973.