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Meng, Nannan; Ren, Jian; Liu, Yang; Huang, Yi; Petit, Tristan; Zhang, Bin . (2018). Engineering oxygen-containing and amino groups into two-dimensional atomically-thin porous polymeric carbon nitrogen for enhanced photocatalytic hydrogen production. Energy & Environmental Science, (), 10.1039.C7EE03592F–. doi:10.1039/c7ee03592f 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research