PACS:94.20.Bb, 41.20.Jb, 91.25.St (all) DOI:10.1070/PU1970v012n04ABEH004065 URL: https://ufn.ru/en/articles/1970/4/j/ Citation: Makarov G I, Novikov V V "Problems in the Propagation of Superlong Radio Waves in the Earthionosphere Waveguide Channel" Sov. Phys. Usp.12 581–583 (1970)