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- [5] The propagation of radio waves over the surface of the earth and in the upper atmosphere PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1937, 25 (09): : 1203 - 1236
- [6] The propagation of radio waves over the surface of the earth and in the upper atmosphere PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1936, 24 (10): : 1367 - 1387
- [7] The propagation of radio waves over a finitely conducting spherical earth PHILOSOPHICAL MAGAZINE, 1938, 25 (171): : 817 - 834