KUMAR, P.; KUMAR, N. Perforated peptic ulcer (PPU): a one year review in tertiary care hospital in Uttarakhand, India. International Surgery Journal, [S. l.], v. 5, n. 1, p. 82–86, 2017. DOI: 10.18203/2349-2902.isj20175533. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/2316. Acesso em: 10 nov. 2025.