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Vinoy, KJ and Pal, A (2010) Dual-frequency characteristics of Minkowski-square ring antennas. In: IET Microwaves, Antennas & Propagation, 4 (2). pp. 219-224.
Pal, A and Behera, S and Vinoy, KJ (2009) Design of multi-frequency microstrip antennas using multiple rings. In: IET Microwaves, Antennas & Propagation, 3 (1). pp. 77-84.