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G.F.S.. (1926). The partial tones of a struck string. Part I. Experimental investigation of the fundamental : W. H. George. (Phil. Mag., Aug., 1925). , 201(1), 120–0. doi:10.1016/s0016-0032(26)91036-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research