Reshkova, V. “Overlap of Granulomatosis With Polyangiitis and Ankylosing Spondylitis, Large Joints Arthritis and Elevated Rheumatoid Factors”. Rheumatology (Bulgaria), Vol. 29, no. 4, Oct. 2021, pp. 99-04, doi:10.35465/29.4.2021.pp99-104.