YU, Jian-Chun; ZHANG, Mei-Hua; YU, Ling; ZHAI, Li-Ping; SONG, Xia; DONG, Fang-Di; QIU, Yi. Experiment of a novel four-spherical intrauterine contraceptive device with nickel-titanium. Clinical Journal of Obstetrics and Gynecology, [S. l.], v. 3, n. 2, p. 142–144, 2020. DOI: 10.29328/journal.cjog.1001068. Disponível em: https://www.obstetricgynecoljournal.com/index.php/cjog/article/view/cjog-aid1068. Acesso em: 3 dec. 2025.