Muñoz Delgado, Saulo, Luis Fernando Valencia, Ivonne Villa R., Hernando Valdivieso, and Alvaro Sánchez. “Techography. Intrauterine Localization of Copper T-Type Devices by Transabdominal Sonogram”. Colombia Medica 21, no. 4 (December 31, 1990): 149–154. Accessed November 22, 2024. https://colombiamedica.univalle.edu.co/index.php/comedica/article/view/6320.