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Wei Gao, Jianping Sui, Zhiyong Chen, Fang Yu, Rongwu Sheng. A low noise and ultra-narrow bandwidth frequency-locked loop based on the beat method. IEEE Trans. Ultrason., Ferroelect., Freq. Contr. 2011 Jun;58(6):1155–8. doi: 10.1109/tuffc.2011.1925. |