1. T. Mitsui, Review Yukikagaku no shimpo (Progress in Organic Chemistry). Vol. X. Tokyo: Kyoritsu. 1955.
2. H. W. Safford andG. L. Stragand, Analyt. Chemistry23, 520 (1951).
3. T. Kono, K. Sato, M. Suzuki andI. Isobe, J. Agr. Chem. Soc. Japan29, 560 (1955).
4. T. Mitsui, Kagaku no Ryoiki5, 687 (1951).
5. T. Mitsui, Bull. Res. Inst. Food Science, Kyoto Univ.17, 20 (1955).