Holzer, H. and Holldorf, A. [Isolation of D-glycerate dehydrogenase, some properties of the enzyme and its application to the enzymic-optic determination of hydroxypyruvate in presence of pyruvate.]. Biochem. Z. 1957, 329 (4): 292–312. PMID13522707.* Stafford, H.A., Magaldi, A. and Vennesland, B. The enzymatic reduction of hydroxypyruvic acid to D-glyceric acid in higher plants. J. Biol. Chem. 1954, 207 (2): 621–629. PMID13163046.