1. Apparatura dlya issledovaniya vneshnei ionosfery (Equipment for Studying the Topside Ionosphere), Moscow: IZMIRAN, 1980, p. 303.
2. Ben’kova, N.P., Kozlov, E.F., Kochenova, N.A., Samorokin, N.I., and Fligel’, M.D., Struktura subavroral’noi ionosfery (Structure of the Subauroral Ionosphere), Moscow: Nauka.
3. Gershman, B.N., Erukhimov, L.M., and Yashin, Yu.Ya., Volnovye yavleniya v ionosfere i kosmicheskoi plazme (Wave Phenomena in the Ionosphere and Space Plasma), Moscow: Nauka, 1984.
4. Karpachev, A.T., Deminov, M.G., and Afonin, V.V., Model of the Mid-Latitude Ionospheric Trough on the Base of Cosmos-900 and Intercosmos-19 Satellites Data, Adv. Space Res., 1996, vol. 18, no. 6, pp. 221–230.
5. Kravtsov, Yu.A. and Orlov, Yu.I., Geometricheskaya optika neodnorodnykh sred (Ray Optics of Inhomogeneous Mediums), Moscow: Nauka, 1980.