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Belletti, Beatrice; Cerioni, Roberto; Iori, Ivo . (2001). Physical Approach for Reinforced-Concrete (PARC) Membrane Elements. Journal of Structural Engineering, 127(12), 1412–1426. doi:10.1061/(ASCE)0733-9445(2001)127:12(1412) 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research