%0 Journal Article %A L P Parker %A C W Seward %A C K Osterland %T Occurrence of antigammaglobulins in effusion fluids of diverse aetiology. %D 1974 %R 10.1136/ard.33.3.262 %J Annals of the Rheumatic Diseases %P 262-267 %V 33 %N 3 %U https://ard.bmj.com/content/annrheumdis/33/3/262.full.pdf