Nakagawa, S, and H. Tagami. “Metaplastic Bone Formation in the Subcutaneous Nodule of a Patient With Mixed Connective Tissue Disease”. Acta Dermato-Venereologica 77, no. 1 (January 1, 1997): 64–65. Accessed July 24, 2026. https://medicaljournalssweden.se/actadv/article/view/14758.