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Boris Aronov; Tetsuo Asano; Yosuke Kikuchi; Subhas C. Nandy; Shinji Sasahara; Takeaki Uno. (2008). A Generalization of Magic Squares with Applications to Digital Halftoning. , 42(2), 143–156. doi:10.1007/s00224-007-9005-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research