RT Journal Article SR Electronic T1 Countercurrent immunoelectrophoresis: improved detection of pneumococcal capsular antigens in sputum by incorporation of a carboxylated derivative of phenyl boronic acid. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 960 OP 962 DO 10.1136/jcp.32.9.960 VO 32 IS 9 A1 Kelsey, M C A1 Reed, C S YR 1979 UL http://jcp.bmj.com/content/32/9/960.abstract AB