Evaluation of cardiac abnormalities in patients with systemic sclerosis by echocardiography and Doppler Murata, I.; Yanagawa, T.; Kihara, H.; Shinohara, S.; Ito, K. American Journal of Noninvasive Cardiology 7(6): 346-352 1993 https://eurekamag.com/research/008/633/008633025.php