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A. de Jager; J.J. de Vrieze; J. Reedijk. (1976). The coordination chemistry of 2,6-dimethyl-4-pyrone. , 20(none), 59–64. doi:10.1016/s0020-1693(00)94091-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research