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Smith, P.K.; Gorham, A.T.; Smith, E.R.B., Thermodynamic Properties of Solutions of Amino Acids and Related Substances VII. The Ionization of SOme Hydrosyamino Acids and Proline in Aqueous Solution from One to Fifty Degrees, J. Biol. Chem., 1942, 144, 636-45. [all data]