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Manickam Selvaraj; Byoung Ryul Min; Yong Gun Shul; Tai Gyu Lee. (2004). Comparison of mesoporous solid acid catalysts in the production of DABCO by cyclization of ethanolamine: I. Synthesis and characterization of mesoporous solid acid catalysts. , 74(1-3), 143–155. doi:10.1016/j.micromeso.2004.06.014 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research