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This work was supported by National Natural Science Foundation of China (Grant No. 61871149).
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Yan, F., Jin, M., Zhou, H. et al. Low-degree root-MUSIC algorithm for fast DOA estimation based on variable substitution technique. Sci. China Inf. Sci. 63, 159206 (2020). https://doi.org/10.1007/s11432-018-9635-0