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Leca, Dominique; Fensterbank, Louis; Lacôte, Emmanuel; Malacria, Max . (2005). Recent advances in the use of phosphorus-centered radicals in organic chemistry. Chemical Society Reviews, 34(10), 858–. doi:10.1039/b500511f 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research