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P.P.J. van der Tol; W. Schrader; B. Aernouts. (2010). Pressure distribution at the teat–liner and teat–calf interfaces. , 93(1), 0–52. doi:10.3168/jds.2008-1864 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research