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. (1964). Partial pressure measurements in high and ultra-high vacuum systems, Part 1 : W. K. Huber, Vacuum13 (10), October 1963, pp. 399–412. , 3(4), 316–0. doi:10.1016/0026-2714(64)90059-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research