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Cheraghi, P.; Yi Ma, ; Tafazolli, R.; Zhengwei Lu, . (2012). Cluster-Based Differential Energy Detection for Spectrum Sensing in Multi-Carrier Systems. IEEE Transactions on Signal Processing, 60(12), 6450–6464. doi:10.1109/TSP.2012.2212434 

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