PERENC, L. Genotypic and phenotypic variability in the ring chromosome 21 syndrome. European Journal of Clinical and Experimental Medicine, [S. l.], v. 13, n. 4, p. 394–405, 2015. DOI: 10.15584/medrev.2015.4.7. Disponível em: https://journals.ur.edu.pl/ejcem/article/view/12490. Acesso em: 7 feb. 2026.