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Barndorff-Nielsen, Ole E.; Resnick, Sidney I.; Mikosch, Thomas . (2001). Lévy Processes || Lévy Processes in the Physical Sciences. , 10.1007/978-1-4612-0197-7(Chapter 11), 241–266. doi:10.1007/978-1-4612-0197-7_11 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research