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Henri Brunner; Jürgen Bügler; Bernhard Nuber. (1995). Enantioselective catalysis 98. Preparation of 9-amino(9-deoxy)cinchona alkaloids. , 6(7), 1699–1702. doi:10.1016/0957-4166(95)00215-b 
10.1016/0957-4166(95)00215-b