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Appleton EV., 1935, P R SOC LOND A, V150, P685, DOI [10.1098/rspa.1935.0129, DOI 10.1098/RSPA.1935.0129]
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GROSSKOPF J, 1940, TELEGR FERNSPR FUNK, V29, P127
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Martyn D.F., 1935, P PHYS SOC, V47, P323, DOI DOI 10.1088/0959-5309/47/2/311
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The relation between ionospheric transmission phenomena at oblique incidence and those at vertical incidence
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Extension of normal-incidence ionosphere measurements to oblique-incidence radio transmission
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JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS,
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