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Hu, Ning; Wang, Enci; Lin, Zesen; Kong, Xu; Cheng, Fuzhen; Fan, Zou; Fang, Guangwen; Lin, Lin; Mao, Yewei; Wang, Jing; Zhou, Xu; Zhou, Zhiming; Zhu, Yinan; Zou, Hu . (2018). M101: Spectral Observations of H ii Regions and Their Physical Properties. The Astrophysical Journal, 854(1), 68–. doi:10.3847/1538-4357/aaa6ca 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research