RT Journal Article SR Electronic T1 The influence of microscopic technology on knowledge of cartilage surface structure. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 235 OP 258 DO 10.1136/ard.31.4.235 VO 31 IS 4 A1 Gardner, D L YR 1972 UL http://ard.bmj.com/content/31/4/235.abstract AB