Dauylbayev, Muratkhan, and Nuryla Absadyk. “CAUCHY PROBLEM WITH SINGULARITY FOR SINGULARLY PERTURBED INTEGRO-DIFFERENTIAL EQUATIONS”. Central Asia Science Review 1, no. 1 (August 29, 2025): 35–40. Accessed October 20, 2025. https://casrjournal.com/index.php/pub/article/view/4.