ANKIT SHARMA3, L. S. P. K. S. Preservation of Historical Documents by Using Image Thresholding: A Review. International Journal of Engineering Technology and Computer Research, [S. l.], v. 3, n. 1, 2015. Disponível em: https://www.ijetcr.ijmbs.info/index.php/ijetcr/article/view/116. Acesso em: 23 may. 2026.