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Nizhny Novgorod Architecture and Construction Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 37, No. 4, pp. 531–534, April, 1994.
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Kolpakov, A.B. On the possibility of increasing the radiation efficiency of a circular antenna by the use of various inhomogeneities. Radiophys Quantum Electron 37, 332–334 (1994). https://doi.org/10.1007/BF01046036
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DOI: https://doi.org/10.1007/BF01046036