C. Tanegashima

Studies on the Isomerization of 2,4-Dinitrophenylhydrazones of Some Aliphatic α-Keto Acids and the Preparation of Their Geometrical Isomers

H. Katsuki, M. Tokushige, Shozo Tanaka, 1972 .

Improved direct method for determination of keto acids by 2,4-dinitrophenylhydrazine.

H. Katsuki, S. Tanaka, T. Yoshida, 1971, Analytical biochemistry.

Improved method for the separation and characterization of keto acid 2,4-dinitrophenylhydrazones.

H. Katsuki, S. Tanaka, T. Yoshida, 1968, Analytical biochemistry.