1. WESTÖÖ, G. and RYDÄLV, M., Var. Föda 23, 179 (1971).
2. Research Laboratories of the Canners Association of Japan, Private communication (1971).
3. BACHE, C., GUTENMANN, W. and LISK, D., Science 172, 951 (1971).
4. MUNNS, R. and HOLLAND, D., J. Ass. Offic. Anal. Chem. 54, 202 (1971).
5. WESTÖÖ, G., Acta Chem. Scand. 20, 2131 (1966).