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Tang, Qiheng; Gao, Kezheng . (2017). Structure analysis of polyether-based thermoplastic polyurethane elastomers by FTIR, <sup>1</sup> H NMR and <sup>13</sup> C NMR. International Journal of Polymer Analysis and Characterization, (), 1–6. doi:10.1080/1023666X.2017.1312754 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research