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Kaufman, T. S., Ponzo, V. L., & Zinczuk, J. (1996). A TRIPHOSGENE-BASED SYNTHESIS OF (S)-α,α-DIPHENYL-2-PYRROLIDINEMETHANOL. Organic Preparations and Procedures International, 28(4), 487–490. doi:10.1080/00304949609356560 
10.1080/00304949609356560