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Cui, Guolong; Kong, Lingjiang; Yang, Xiaobo . (2012). Reconstruction Filter Design for Stepped-Frequency Continuous Wave. IEEE Transactions on Signal Processing, 60(8), 4421–4426. doi:10.1109/TSP.2012.2197206 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research