Brsakoska, Slagjana. “ABOUT THE ZEROS AND THE OSCILLATORY CHARACTER OF THE SOLUTION OF ONE AREOLAR EQUATION OF SECOND ORDER”. Matematichki Bilten 40, no. 1 (January 1, 2016). Accessed June 13, 2026. https://bilten.smm.org.mk/index.php/bilten/article/view/1816.