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Pancera, Sabrina M.; Gliemann, Hartmut; Schimmel, Thomas; Petri, Denise F. S. . (2006). Effect of pH on the Adsorption and Activity of Creatine Phosphokinase. The Journal of Physical Chemistry B, 110(6), 2674–2680. doi:10.1021/jp0532364 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research