Natural Cubic Spline for Parabolic Equation with Constant and Variable Coefficients. International Journal of Engineering and Computer Science, india, v. 14, n. 07, p. 27508–27530, 2025. DOI: 10.18535/ijecs.v14i07.5188. Disponível em: https://ijecs.in/index.php/ijecs/article/view/5188. Acesso em: 5 dec. 2025.