S. Lambova, N. Stoilov, and V. Boyadzhieva, “The utility of USB microscope for assessment of Raynaud’s phenomenon patients in rheumatology practice”, Rheumatol Bul, vol. 31, no. 4, pp. 28–41, Mar. 2024, doi: 10.35465/31.4.2023.pp28-41.