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Ashoke Raman, K.. (2018). Dynamics of simultaneously impinging drops on a dry surface: Role of inhomogeneous wettability and impact shape. Journal of Colloid and Interface Science, 516(), 232–247. doi:10.1016/j.jcis.2018.01.063 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research