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V. Pawar; C. Weaver; S. Jani. (2011). Physical characterization of a new composition of oxidized zirconium–2.5 wt% niobium produced using a two step process for biomedical applications. , 257(14), 6118–6124. doi:10.1016/j.apsusc.2011.02.014 

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