EL-SHAFIE, K. Belching as a Presenting Symptom of Angina Pectoris. Sultan Qaboos University Medical Journal, [S. l.], v. 7, n. 3, p. 257–260, 2007. Disponível em: https://journals.squ.edu.om/index.php/squmj/article/view/1310. Acesso em: 2 jun. 2025.