Marotta, H., R. Montisci, F. Tiso, S. Pontarollo, M. Rizzo, F. Tona, S. Iliceto, and F. Cozzi. “Two-Years Therapy With Bosentan of Pulmonary Arterial Hypertension Related to Connective Tissue Diseases”. Reumatismo 59, no. 4 (1): 299-303. Accessed July 11, 2020. https://www.reumatismo.org/index.php/reuma/article/view/reumatismo.2007.299.