1. Avakyan, S.V., Serova, A.E., and Voronin, N.A., Role of Rydberg Atoms and Molecules in the Upper Atmosphere, Geomagn. Aeron., 1997, vol. 37, no. 3, pp. 99–105.
2. Avakyan, S.V., Collisions of Rydberg-Excited Neutrals in the Ionosphere and Microwave Radiation, J. Opt. Technol., 2006, vol. 73, no. 4, pp. 302–303.
3. Avakyan, S.V. and Voronin, N.A., Condensation Process in the Low Atmosphere and Microwave Radiation of the Sun and Ionosphere, Proc. 6th Intern. Conf. on Problems of Geocosmos, St. Petersburg, 2006, pp.24–28.
4. Banks, P.M. and Kockarts, G., Aeronomy, New York: Academic Press, 1973.
5. Delone, N.B., Rydberg Atoms, Sorosovskii obrazovatel’nyi zhurnal, 1998, no. 4b, pp. 64–70.