RT Journal Article SR Electronic T1 Quantitative Problems in Biochemistry JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 461 OP 461 DO 10.1136/jcp.26.6.461-a VO 26 IS 6 A1 Barbara H. Billing YR 1973 UL http://jcp.bmj.com/content/26/6/461.1.abstract AB