1. V.A. Bailey: Nature 139, 838 (1937)
2. A.V. Gurevich: Nonlinear Phenomena in the Ionosphere (Springer, Berlin Heidelberg (1978)
3. V.B. Gil’denburg, S.V. Golubev: Sov. Phys.-JETP 40, 46 (1974)
4. V.B. Gil’denburg, A.V. Kochetov, A.G. Litvak, A.M. Feigin: Sov. Phys.-JETP 57, 28 (1983)
5. A.G. Litvak, V.A. Mironov, G.M. Fraiman, A.D. Yunakovskii: Sov. J. Plasma Phys. 1, 31 (1975)