Mustăţa, C., A. C. Mureșan, and R. Mustăţa. “The Approximation by Spline Functions of the Solution of a Singularly Perturbed Bilocal Problem”. Rev. Anal. Numér. Théor. Approx. 27, no. 2 (August 1, 1998): 297–308. Accessed April 23, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1998-vol27-no2-art10.