Belyi, T., and Y. Zelenin. “Dielectric Functions of Thermal Electrons Polarization of Dry Atmosphere (up to the Heights Plane of 12 Km)”. Geofizicheskiy Zhurnal, vol. 36, no. 5, Oct. 2014, pp. 91-117, doi:10.24028/gzh.0203-3100.v36i5.2014.111571.