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I.D. Kaganovich; Ariel Shnidman; Harrison Mebane; R.C. Davidson. (2009). Calculation of charge-changing cross-sections of ions or atoms colliding with fast ions using the classical trajectory method. , 606(1-2), 196–204. doi:10.1016/j.nima.2009.03.084 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research