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Mokrý, Pavel; Wang, Yongli; Tagantsev, Alexander K.; Damjanovic, Dragan; Stolichnov, Igor; Setter, Nava . (2009). thin films. Physical Review B, 79(5), 054104–. doi:10.1103/physrevb.79.054104 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research