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Rahn, K.; De Grandis, S.A.; Clarke, R.C.; McEwen, S.A.; Galán, J.E.; Ginocchio, C.; Curtiss, R.; Gyles, C.L. . (1992). Amplification of an invA gene sequence of Salmonella typhimurium by polymerase chain reaction as a specific method of detection of Salmonella. Molecular and Cellular Probes, 6(4), 271–279. doi:10.1016/0890-8508(92)90002-F 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research