Kujumdžieva-Nikoloska, M. (1993) “ITERATIVE FORMULAS FOR SOLVING LINEAR DIFFERENTIAL EQUATIONS OF I AND II ORDER”, Matematichki Bilten, 17(1), pp. 93–100. Available at: https://bilten.smm.org.mk/index.php/bilten/article/view/1504 (Accessed: 14 August 2026).