Peronato, G., P. De Sandre, M. Podswiadek, S. Arfiero, and L. Bozzola. “Cardiac Tamponade Preceding Skin Involvement in Systemic Sclerosis”. Reumatismo 54, no. 3 (1): 257-260. Accessed May 27, 2020. https://www.reumatismo.org/index.php/reuma/article/view/reumatismo.2002.257.