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Ziyang Zhang; K. Hidajat; Ajay K. Ray; M. Morbidelli. (2002). Multiobjective optimization of SMB and varicol process for chiral separation. , 48(12), 2800–2816. doi:10.1002/aic.690481209 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research