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Flocke, Norbert. (2002). [Theoretical and Computational Chemistry] Valence Bond Theory Volume 10 || Symmetric group approach to the theory of Heisenberg lattices. , (), 603–634. doi:10.1016/s1380-7323(02)80020-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research