W. F. J. Karstens. Enantioselective synthesis of isotopically labelled L--amino acids preparation of 13C-, 18O-and 2H-labelled L-serines and L-threonines J. Labelled Compd. Radiopharm.1995 Volume 36, Issue 11 , Pages 1077 - 1096
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http://dx.doi.org/10.1002/jlcr.2580361108