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T. S. Pavlov; G. E. Samonina; L. A. Andreeva; N. F. Myasoedov; I. P. Ashmarin. (2004). A New Property of the Synthetic Anxiolytic Selank and Its Derivatives. , 397(1-6), 281–283. doi:10.1023/b:dobs.0000039692.94366.2c 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research