ESA, Rawaa I.; SALEH, Atefa J. Numerical Treatment of First Order Volterra Integro-Differential Equation Using Non-Polynomial Spline Functions. Iraqi Journal of Science, [S. l.], p. 114–121, 2020. DOI: 10.24996/ijs.2020. SI.1.15. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/2058.. Acesso em: 7 dec. 2025.