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Z.P Zhang; H.F Chen; S.W Ye; J.W Zhao. (1996). Comparison of the BP training algorithm and LVQ neural networks for e, μ, π identification. , 379(2), 271–275. doi:10.1016/0168-9002(96)00733-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research