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Nakamura, Koichi; Michihiro, Yoshitaka; Katayama, Fumiaki; Moriga, Toshihiro; Mahbubar, Rahman Md.; Nakabayashi, Ichiro; Kanashiro, Tatsuo . (2005). Phonon Echo Study on Lithium Ionic Diffusion in LiNbO <sub/>3</sub> Powder. Japanese Journal of Applied Physics, 44(6A), 4043–4046. doi:10.1143/JJAP.44.4043 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research