Valencia Caballero, Víctor, Mijail Cornejo, Diana Caso Pérez, and Charles Huamaní. 2009. “Overlap Syndrome and Systemic Sclerosis: A Case Report”. ACTA MEDICA PERUANA 26 (2), 95 - 96. https://amp.cmp.org.pe/index.php/AMP/article/view/1506.