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Diekert, Volker; Habib, Michel . (2004). [Lecture Notes in Computer Science] STACS 2004 Volume 2996 || Solving the 2-Disjoint Paths Problem in Nearly Linear Time. , 10.1007/b96012(Chapter 31), 350–361. doi:10.1007/978-3-540-24749-4_31 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research