RT Journal Article SR Electronic T1 Soft Ionization Biological Mass Spectrometry JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 905 OP 905 DO 10.1136/jcp.35.8.905-c VO 35 IS 8 A1 AM Lawson YR 1982 UL http://jcp.bmj.com/content/35/8/905.3.abstract AB