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- [5] EFFECTS OF SMALL LOCAL CHANGE IN PHASE VELOCITY ON PROPAGATION OF VLF RADIO SIGNAL JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS SECTION D-RADIO SCIENCE, 1964, D 68 (06): : 709 - +
- [6] EXPERIMENTAL PHASE DETERMINATION OF THE VELOCITY OF VLF WAVES RADIONAVIGATION SYSTEMS OMEGA SIGNALS RADIOTEKHNIKA I ELEKTRONIKA, 1984, 29 (04): : 795 - 797
- [9] IONOSPHERIC INTERACTION OF VLF RADIO-WAVES JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS, 1972, 34 (03): : 421 - &