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Ghosh, Rajshekhar; Zhang, Xiawei; Achord, Patrick; Emge, Thomas J.; Krogh-Jespersen, Karsten; Goldman, Alan S. . (2007). Dimerization of Alkynes Promoted by a Pincer-Ligated Iridium Complex. C−C Reductive Elimination Inhibited by Steric Crowding. Journal of the American Chemical Society, 129(4), 853–866. doi:10.1021/ja0647194 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research