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Luo, Shuangjiang; Liu, Qiang; Zhang, Baohua; Wiegand, Jennifer R.; Freeman, Benny D.; Guo, Ruilan . (2015). Pentiptycene-based polyimides with hierarchically controlled molecular cavity architecture for efficient membrane gas separation. Journal of Membrane Science, 480(), 20–30. doi:10.1016/j.memsci.2015.01.043 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research