Zgair, A. K. (2013). Plaque Forming Cell Technique for Counting IgG and IgM antibody-secreting cells in peripheral blood of patients with rheumatoid arthritis. World Journal of Experimental Biosciences (ISSN: 2313-3937) , 1(2), 37-42. https://wjebio.com/index.php/journal/article/view/29