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C. Schnieders; K. Müllen; C. Braig; H. Schuster; J. Sauer. (1984). The cope rearrangement in substituted semibullvalenes as studied by dynamic 13C NMR. , 25(7), 749–752. doi:10.1016/s0040-4039(01)80016-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research