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Matsumoto, Koji; Yamada, Ryuhei; Kikuchi, Fuyuhiko; Kamata, Shunichi; Ishihara, Yoshiaki; Iwata, Takahiro; Hanada, Hideo; Sasaki, Sho . (2015). Internal structure of the Moon inferred from Apollo seismic data and selenodetic data from GRAIL and LLR. Geophysical Research Letters, 42(18), 7351–7358. doi:10.1002/2015gl065335 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research