[1]
A. Samodurov and S. Cvejić, “METHOD OF VARIATION OF PARAMETERS IS NOT EXHAUSTED”, Mat. Bilt., vol. 16, no. 1, pp. 81–83, Jan. 1992, Accessed: Nov. 01, 2026. Available: https://bilten.smm.org.mk/index.php/bilten/article/view/1494