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Wipf, Peter; Jung, Jae-Kyu (1999). "Nucleophilic Additions to 4,4-Disubstituted 2,5-Cyclohexadienones: Can Dipole Effects Control Facial Selectivity?". Chemical Reviews. 99 (5): 1469–1480. doi:10.1021/cr9803838. PMID11749453.