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Schönenberger, Helmut and Brinkmann, R. and Baman, E. (1963) Separation of organic bases by Craig distribution. II. Constellation of diastereomeric N,N'-dibutyl-alpha ,alpha '-diphenylethylenediamines. Archiv der Pharmazie und Berichte der Deutschen Pharmazeutischen Gesellschaft 296, pp. 762-770.