3Magee P N, Bame J M. Carcinogenic nitroso compounds [J] . Adv Cancer Res, 1967, 10: 63.
4Shank R C. Toxicology of nitroso compounds. [J] . Toxicol Appl Pharmcol, 1975, 31: 361.
5Mirvish SS, et al. Studies related to nitrosamide formation: nitrosation in solvent: water and solvent system, Nitrosomethylurea formation in the rat stomach and analysis of a fish product for ureas [J] . IARC Sci Publ, Lyon, France, 1978, 19; 161.
6Ellen G, et al. Volatile n-nitrosamine, nitrate and nitrite in urine and saliva of healthy volunteers after administration of large amounts of nitrate [J] . IARC Sci Pub Lyon, France, 1982, 41: 365.