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Andrea Ann Seymour. (1991). The Pharmacology of SQ 28,603, an Inhibitor of Neutral Endopeptidase 3.4.24.11. , 9(3), 285–298. doi:10.1111/j.1527-3466.1991.tb00417.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research