RT Journal Article SR Electronic T1 Units, Symbols and Abbreviations. A Guide for Biological and Medical Editors and Authors JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 406 OP 406 DO 10.1136/oem.28.4.406 VO 28 IS 4 A1 Heath, D. F. YR 1971 UL http://oem.bmj.com/content/28/4/406.1.abstract AB