Inoue, O.; Seiji, K.; Kawai, T.; Watanabe, T.; Jin, C.; Cai, S. X.; Chen, Z.; Qu, Q. S.; Zhang, T.; Ikeda, M. Excretion of methylhippuric acids in urine of workers exposed to a xylene mixture: Comparison among three xylene isomers and toluene. International Archives of Occupational and Environmental Health. 1993, 64 (7): 533–9. PMID 8482596. S2CID 21534640. doi:10.1007/bf00381104.
Inoue, O.; Seiji, K.; Kawai, T.; Watanabe, T.; Jin, C.; Cai, S. X.; Chen, Z.; Qu, Q. S.; Zhang, T.; Ikeda, M. Excretion of methylhippuric acids in urine of workers exposed to a xylene mixture: Comparison among three xylene isomers and toluene. International Archives of Occupational and Environmental Health. 1993, 64 (7): 533–9. PMID 8482596. S2CID 21534640. doi:10.1007/bf00381104.
Inoue, O.; Seiji, K.; Kawai, T.; Watanabe, T.; Jin, C.; Cai, S. X.; Chen, Z.; Qu, Q. S.; Zhang, T.; Ikeda, M. Excretion of methylhippuric acids in urine of workers exposed to a xylene mixture: Comparison among three xylene isomers and toluene. International Archives of Occupational and Environmental Health. 1993, 64 (7): 533–9. PMID 8482596. S2CID 21534640. doi:10.1007/bf00381104.