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Stefanova, H I; Napier, R M; East, J M; Lee, A G . (1987). Effects of Mg <sup>2+</sup> , anions and cations on the Ca <sup>2+</sup> + Mg <sup>2+</sup> -activated ATPase of sarcoplasmic reticulum. Biochemical Journal, 245(3), 723–730. doi:10.1042/bj2450723 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research