NIGAM, V. K.; NIGAM, S. Nigam’s pinch test to locate a chronic deep seated small perianal abscess. International Surgery Journal, [S. l.], v. 8, n. 2, p. 660–663, 2021. DOI: 10.18203/2349-2902.isj20210380. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/6972. Acesso em: 30 apr. 2026.