RT Journal Article SR Electronic T1 Electron and light microscopical observations and serological findings in rheumatoid arthritis. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 515 OP 523 DO 10.1136/ard.32.6.515 VO 32 IS 6 A1 A E Helder A1 T M Feltkamp-Vroom A1 R L Nienhuis YR 1973 UL http://ard.bmj.com/content/32/6/515.abstract AB