V. I. Vodolazkin

An empirical model for the global distributions of density, temperature and effective collision frequency of electrons in the ionosphere

T. Gulyaeva, S. Ivanova, L. S. Mironova, 1987 .

Usage of regularization techniques for effective electron collision frequency determination from oblique ionospheric sounding

P. Denisenko, V. I. Vodolazkin, N. V. Nastasyina, 1996 .