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2. Ramsdale, P.A.: ‘Active loop-dipole antennas’, 1970, M.Sc. thesis, University of Birmingham
3. Schelkunoff, S.A., and Friis, H.T.: Antennas, theory and practice, (Wiley 1952), p. 238–241 298–299
4. Ramsdale, P.A.: ‘Field patterns of short active antennas’, Aerospace antennas, 1971), p. 145–150IEE Conf. Publ.77