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Jäger, W.; Luckhaus, S. . (1992). On explosions of solutions to a system of partial differential equations modelling chemotaxis. Transactions of the American Mathematical Society, 329(2), 819–824. doi:10.1090/s0002-9947-1992-1046835-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research