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Yun-Lin Chen; Jing-Jun Xu; Xiao-Jun Chen; Yong-Fa Kong; Guang-Yin Zhang. (2001). Domain reversion process in near-stoichiometric LiNbO3 crystals. , 188(5-6), 359–364. doi:10.1016/s0030-4018(00)01137-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research