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Kishk, A. A.; Glisson, A. W.; Junker, G. P. . (2001). Bandwidth Enhancement for Split Cylindrical Dielectric Resonator Antennas. Progress In Electromagnetics Research, 33(), 97–118. doi:10.2528/pier00122803 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research