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3. Evidence for field-aligned ionization irregularities between 200 and 1000 km above the earth's surface;Calvert;Proc. International Conference on the ionosphere,1963
4. Evidence of the laminar nature of the exosphere obtained by means of guided high-frequency wave propagation;Gallet;Phys. Rev. Letters,1961
5. Jackson, J. E., , NASA investigation of the topside ionosphere, Goddard Space Flight Center, Greenbelt, Md., 1963,