LÓPEZ-GARCÍA, Luis J.; OJEDA, Algia; TORO, Doris H. Primary Duodenal Signet Ring Cell Carcinoma Presenting as Gastric Outlet Obstruction. Puerto Rico Health Sciences Journal, [S. l.], v. 25, n. 4, 2009. Disponível em: https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/292. Acesso em: 19 dec. 2025.