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Xue, Minggao; Zhou, Shaobo; Hu, Shigeng . (2010). Stability of Nonlinear Neutral Stochastic Functional Differential Equations. Journal of Applied Mathematics, 2010(), 1–26. doi:10.1155/2010/425762 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research