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Superconducting filter with a linear phase for third-generation mobile communications, Li, Fei, Zhang, Xueqiang, Meng, Qingduan, Sun, Liang, Zhang, Qiang, Li, Chunguang, Li, Shunzhou, He, Aisheng, Li, Hong, He, Yusheng
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Li et al. (2007) studied this question.
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