Nonprogressive congenital cerebellar ataxia, iris heterochromia, mental retardation and language impairment in two brothers - Lamônica, Dionísia Aparecida Cusin; Maximino, Luciana Paula; Abramides, Dagma Venturini Marques; Souza, Deise H.; Richieri-Costa, Antonio (Clinical Dysmorphology, 2010)