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G. Milani; P.B. Lourenço; A. Tralli. (2006). Homogenised limit analysis of masonry walls, Part I: Failure surfaces. Computers & Structures, 84(3-4), 166–180. doi:10.1016/j.compstruc.2005.09.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research