Acid and α,β-Dihydroxy-β-methylvaleric Acid, Precursors of Valine and Isoleucine 1,2. Journal of the American Chemical Society. 1954-02, 76 (4): 1085–1087
PMID 4388025. Hill RK, Sawada S and Arfin SM. Stereochemistry of valine and isoleucine biosynthesis. IV Synthesis, configuration, and enzymatic specificity of