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Norman E. Sharpless, Alberta E. Blair, Charles R. Maxwell, The Effect of Ionizing Radiation on Amino Acids: II. The Effect of X-Rays on Aqueous Solutions of Alanine, Radiation Research, Vol. 2, No. 2 (Apr., 1955), pp. 135-144
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Sharpless et al. (1955) studied this question.
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