PACS:94.20.wf, 94.20.dj, 94.20.ws, 94.20.wj (all) DOI:10.1070/PU1975v017n04ABEH004653 URL: https://ufn.ru/en/articles/1975/4/ae/ Citation: Grach S M, Litvak A G, Mityakov N A, Rapoport V O, Trakhtengerts V Yu "Toward a Theory of Nonlinear Effects in the Ionosphere" Sov. Phys. Usp.17 616–617 (1975)