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M. de Groot; A.L. Pool-Goudzwaard; C.W. Spoor; C.J. Snijders. (2008). The active straight leg raising test (ASLR) in pregnant women: Differences in muscle activity and force between patients and healthy subjects. , 13(1), 68–74. doi:10.1016/j.math.2006.08.006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research