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Gossetx, W. H.; Perry, T. W.; Mohler, M. T.; Plumlee, M. P.; Beeson, W. M. . (1962). Value of Supplemental Lysine, Methionine, Methionine Analog, and Trace Minerals on High Urea Fattening Rations for Beef Steers. Journal of Animal Science, 21(2), 248–251. doi:10.2527/jas1962.212248x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research