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Boville, Christina E.; Romney, David K.; Almhjell, Patrick James; Sieben, Michaela; Arnold, Frances H. . (2018). Improved synthesis of 4-cyanotryptophan and other tryptophan analogs in aqueous solvent using variants of TrpB from Thermotoga maritima. The Journal of Organic Chemistry, (), acs.joc.8b00517–. doi:10.1021/acs.joc.8b00517 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research