Mittag, M, P. Beckheinrich, and Uwe Haustein. 2001. “Systemic Sclerosis-Related Raynaud’s Phenomenon: Effects of Iloprost Infusion Therapy on Serum Cytokine, Growth Factor and Soluble Adhesion Molecule Levels”. Acta Dermato-Venereologica 81 (4):294-97. https://doi.org/10.1080/00015550152572976.