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Mambrini, M.; Trébosc, J.; Mila, F. . (1999). Residual entropy and spin gap in a one-dimensional frustrated antiferromagnet. Physical Review B, 59(21), 13806–13809. doi:10.1103/PhysRevB.59.13806 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research