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This work was supported by National Natural Science Foundation of China (Grant No. 61671063) and Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 61421001).
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Sun, Y., Li, B. Digital computation of linear canonical transform for local spectra with flexible resolution ability. Sci. China Inf. Sci. 62, 49301 (2019). https://doi.org/10.1007/s11432-018-9585-1