Hyuk Ryu, Jinhyeon Lee, Eun-Teak Sung, and Donghyun Baek, “Wideband VCO and Sigma-Delta Fractional-N Phase Locked Loop for ISU GPS Receiver,” 제 14회 RF/아날로그 회로 워크샵, pp 453-454, Sept, 2014.
Hyuk Ryu, Jinhyeon Lee, Eun-Teak Sung, and Donghyun Baek, “Wideband VCO and Sigma-Delta Fractional-N Phase Locked Loop for ISU GPS Receiver,” 제 14회 RF/아날로그 회로 워크샵, pp 453-454, Sept, 2014.