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K. K. So and K. W. Leung, "Frequency tuning of the dielectric resonator antenna with a parasitic slot", IEEE HK Section MTT/AP/LEOS, pp. 32-35, Oct. 2005
K. K. So and K. W. Leung, "Annular-slot-excited dielectric resonator antenna with a parasitic slot and a backing cavity", Cross Strait Tri-Regional Radio Science and Wireless Technology Conference, vol. 8, pp. 35-36, Oct. 2002
K. K. So and K. W. Leung, "Annular-slot-excited dielectric resonator antenna with a parasitic slot", IEEE HK Section MTT/AP/LEOS, pp. 13-14, Sep. 2002