RT Journal Article SR Electronic T1 Occupational Toxicology, 1st Edition JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 504 OP 504 DO 10.1136/oem.51.7.504-a VO 51 IS 7 A1 F M Kennedy YR 1994 UL http://oem.bmj.com/content/51/7/504.2.abstract AB