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3. 3) Dyer, W. J.: Amines in fish muscle. I. Colorimetric determination of trimethylamine as the picrate salt. J. Fish. Res. Bd. Can., 6, 351, 1945.
4. 4) Conway, E. J.: “Micro-difusion analysis and volumetric error”. 1950.
5. 5) Yokoyama, R.: The new quantitative determination of histamine contained in animal tissues and organs and the contents of histamine in various animal tissues and organs. Tokyo Ijishinshi, 2990, 1948, 1936. (in Japanese)