GRAKOVSKI, A.; ALEXANDROV, A. Spectral method for numerical calculation of derivatives in digital processing of subsurface radar sounding signals. Mathematical Modelling and Analysis, [S. l.], v. 10, n. 1, p. 31–40, 2005. DOI: 10.3846/13926292.2005.9637268. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9660. Acesso em: 9 may. 2025.