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Mazin, I. I.; Jepsen, O.; Andersen, O. K.; Liechtenstein, A. I.; Rashkeev, S. N.; Uspenskii, Y. A. . (1992). : Role of the Ba-O plane. Physical Review B, 45(9), 5103–5106. doi:10.1103/PhysRevB.45.5103 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research