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Shen, L., & Fang, W.-H. (2011). The Reactivity of the 1,4-Biradical Formed by Norrish Type Reactions of Aqueous Valerophenone: A QM/MM-Based FEP Study. The Journal of Organic Chemistry, 76(3), 773–779. doi:10.1021/jo101785z 
10.1021/jo101785z