Micula, G., and A. Ayad. “The Numerical Solution of First Order Volterra Delay Integro-Differential Equations by Spline Functions”. Rev. Anal. Numér. Théor. Approx. 27, no. 1 (February 1, 1998): 117–125. Accessed May 24, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1998-vol27-no1-art13.