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Zhang, Z.; Chan, H. S. . (2010). Competition between native topology and nonnative interactions in simple and complex folding kinetics of natural and designed proteins. Proceedings of the National Academy of Sciences, 107(7), 2920–2925. doi:10.1073/pnas.0911844107 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research