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Abdallah, S.; Psaromiligkos, I.N.. (2012). Blind Channel Estimation for Amplify-and-Forward Two-Way Relay Networks Employing -PSK Modulation. , 60(7), 0–0. doi:10.1109/tsp.2012.2193577 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research