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Bojesen, Troels Arnfred; Sudbø, Asle . (2013). Berry phases, current lattices, and suppression of phase transitions in a lattice gauge theory of quantum antiferromagnets. Physical Review B, 88(9), 094412–. doi:10.1103/PhysRevB.88.094412 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research