Reshkova, Valentina. “Overlap of Granulomatosis With Polyangiitis and Ankylosing Spondylitis, Large Joints Arthritis and Elevated Rheumatoid Factors”. Rheumatology (Bulgaria) 29, no. 4 (October 24, 2021): 99-104. Accessed August 8, 2026. http://www.rheumatologybg.org/journalold/index.php?journal=revmatologiia&page=article&op=view&path[]=127.