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Yuping Tong; Junwu Zhu; Lude Lu; Xin Wang; Xujie Yang. (2008). Preparation and characterization of Ln2Zr2O7 (Ln = La and Nd) nanocrystals and their photocatalytic properties. , 465(1-2), 0–284. doi:10.1016/j.jallcom.2007.10.097 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research