Gunes, Baransel, and Musa Cakir. 2024. “A Fitted Approximate Method for Solving Singularly Perturbed Volterra–Fredholm Integro-Differential Equations With an Integral Boundary Condition”. Ukrains’kyi Matematychnyi Zhurnal 76 (1), 115 -31. https://doi.org/10.3842/umzh.v76i1.7331.