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Joseph L. Duffy; Brian A. Kirk; Liping Wang; George J. Eiermann; Huaibing He; Barbara Leiting; Kathryn A. Lyons; Reshma A. Patel; Sangita B. Patel; Alexsandr Petrov; Giovanna Scapin; Joseph K. Wu; Nancy A. Thornberry; Ann E. Weber. (2007). 4-Aminophenylalanine and 4-aminocyclohexylalanine derivatives as potent, selective, and orally bioavailable inhibitors of dipeptidyl peptidase IV. , 17(10), 2879–2885. doi:10.1016/j.bmcl.2007.02.066 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research