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Medvedev, S.; McQueen, T. M.; Troyan, I. A.; Palasyuk, T.; Eremets, M. I.; Cava, R. J.; Naghavi, S.; Casper, F.; Ksenofontov, V.; Wortmann, G.; Felser, C. . (2009). Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure. Nature Materials, 8(8), 630–633. doi:10.1038/nmat2491 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research