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Schönenberger, Helmut and Brinkman, R. and Bamann, E. (1963) Resolution of N-(DL-N,N-dimethylalanyl)-L-y-ephedrine into its stereoisomeric forms of Craig partition. The possibility of resolution of racemic amino acids into optical isomers using countercurrent methods. Archiv der Pharmazie und Berichte der Deutschen Pharmazeutischen Gesellschaft 296, pp. 33-37.