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Iskhakov, I.; Ribakov, Y.; Holschemacher, K.; Mueller, T. . (2014). Experimental Investigation of Full Scale Two-Layer Reinforced Concrete Beams. Mechanics of Advanced Materials and Structures, 21(4), 273–283. doi:10.1080/15376494.2012.680673 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research