RT Journal Article SR Electronic T1 Ultrastructure of cartilage. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 421 OP 422 DO 10.1136/ard.31.5.421-b VO 31 IS 5 A1 Holt, P J A1 Pal, S G A1 Bennett, R A1 Maunder, C A1 Lewis, S YR 1972 UL http://ard.bmj.com/content/31/5/421.2.abstract AB