Kujumdžieva-Nikoloska, Marija. “ITERATIVE FORMULAS FOR SOLVING LINEAR DIFFERENTIAL EQUATIONS OF I AND II ORDER”. Matematichki Bilten 17, no. 1 (January 1, 1993): 93–100. Accessed August 14, 2026. https://bilten.smm.org.mk/index.php/bilten/article/view/1504.