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A. Cabada; J.A. Cid; R.L. Pouso. (2002). Existence results and approximation methods for functional ordinary differential equations with singular diffusion-type differential operators. , 44(1-2), 111–124. doi:10.1016/s0898-1221(02)00134-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research