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Nannyonga, B.; Mwanga, G.G.; Luboobi, L.S. . (2015). An optimal control problem for ovine brucellosis with culling. Journal of Biological Dynamics, 9(1), 198–214. doi:10.1080/17513758.2015.1056845 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research