1. ACGIH (1984) Biological exposure indices in TLVs threshold limit values for chemicals for 1984?1985. ACGIH 56?63
2. Gerade HW (1962) The aromatic hydrocarbons. In: Patty FA (ed) Industrial hygiene and toxicology, vol II. Interscience, New York, pp 1219?1240
3. Hasegawa K, Shiojima S, Koizumi A, Ikeda M (1983) Hippuric acid and o-cresol in the urine of workers exposed to toluene. Int Arch Occup Environ Health 52:197?208
4. Ikeda M, Ohtsuji H (1969) Significance of urinary hippuric acid determination as an index of toluene exposure. Br J Ind Med 26:244?246
5. Kawai T, Horiguchi S (1981) Normal limit of urinary hippuric acid measured by gaschromatography in the male Japanese subjects. Osaka City Med J 27:111?116