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C. McDonagh; C. Kolle; A.K. McEvoy; D.L. Dowling; A.A. Cafolla; S.J. Cullen; B.D. MacCraith. (2001). Phase fluorometric dissolved oxygen sensor. , 74(1-3), 124–130. doi:10.1016/s0925-4005(00)00721-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research