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Li, X.W.; Zhang, Z.F.; Wang, Zhong Guang; Li, S.X.; Umakoshi, Yukichi . (2001). SEM-ECC Investigation of Dislocation Arrangements in Cyclically Deformed Copper Single Crystals with Different Crystallographic Orientations. Defect and Diffusion Forum, 188-190(), 153–170. doi:10.4028/www.scientific.net/DDF.188-190.153 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research