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Faleskog, Jonas; Barsoum, Imad . (2013). Tension–torsion fracture experiments—Part I: Experiments and a procedure to evaluate the equivalent plastic strain. International Journal of Solids and Structures, 50(25-26), 4241–4257. doi:10.1016/j.ijsolstr.2013.08.029 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research