Retroperitoneal fetus-in-fetu: another supportive evidence for twinning theory. Teratology Studies, [S. l.], v. 1, n. 1, p. e2, 2011. DOI: 10.4081/ts.2011.e2. Disponível em: https://www.pagepressjournals.org/tera/article/view/ts.2011.e2. Acesso em: 25 may. 2026.