Techography. Intrauterine localization of copper T-type devices by transabdominal sonogram. Colombia Medica, [S. l.], v. 21, n. 4, p. 149–154, 1990. DOI: 10.25100/cm.v21i4.6320. Disponível em: https://colombiamedica.univalle.edu.co/index.php/comedica/article/view/6320. Acesso em: 21 feb. 2026.