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Alejandra Gámez; Lin Wang; Christineh N. Sarkissian; Dan Wendt; Paul Fitzpatrick; Jeffrey F. Lemontt; Charles R. Scriver; Raymond C. Stevens. (2007). Structure-based epitope and PEGylation sites mapping of phenylalanine ammonia-lyase for enzyme substitution treatment of phenylketonuria. , 91(4), 0–334. doi:10.1016/j.ymgme.2007.04.015 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research