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Barluenga, José; Tomás-Gamasa, María; Aznar, Fernando; Valdés, Carlos. (2009). Metal-free carbon–carbon bond-forming reductive coupling between boronic acids and tosylhydrazones. , 1(6), 494–499. doi:10.1038/nchem.328 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research