RT Journal Article SR Electronic T1 Principles and Applications of Laboratory Instrumentation JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 521 OP 522 DO 10.1136/jcp.43.6.521-e VO 43 IS 6 A1 Rattenbury, J M YR 1990 UL http://jcp.bmj.com/content/43/6/521.5.abstract AB