NGOC LONG, Nguyen; THANH PHAM, Luan. Improving the stability of the theta and normalized horizontal gradient filters by using the finite-difference vertical derivative. Iranian Journal of Earth Sciences, [S. l.], v. 17, n. 2, 2025. DOI: 10.57647/j.ijes.2025.1702.15. Disponível em: https://oiccpress.com/ijes/article/view/16607. Acesso em: 30 apr. 2026.