Tchernev, G., A. A. Chokoeva, and U. Wollina. “Lichen Amyloidosis Associated With Rheumatoid Arthritis: Unique Presentation in a Bulgarian Patient”. São Paulo Medical Journal, vol. 135, no. 1, Feb. 2017, pp. 76-78, https://periodicosapm.emnuvens.com.br/spmj/article/view/715.