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Kleijn, Laurens H.J.; Müskens, Frederike M.; Oppedijk, Sabine F.; de Bruin, Gerjan; Martin, Nathaniel I. . (2012). A concise preparation of the non-proteinogenic amino acid l-kynurenine. Tetrahedron Letters, 53(47), 6430–6432. doi:10.1016/j.tetlet.2012.09.055 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research