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Tanaka, Masamoto; Mizutani, Wataru; Nakashizu, Tsuneo; Yamazaki, Shuichi; Tokumoto, Hiroshi; Bando, Hiroshi; Ono, Masatoshi; Kajimura, Koji . (1989). Study of Charge Density Waves in 4Hb–TaS <sub/>2</sub> by STM/STS. Japanese Journal of Applied Physics, 28(Part 1, No. 3), 473–476. doi:10.1143/JJAP.28.473 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research