Georgievska, Slobodanka S. “REDUCTION OF A BOUNDARY PROBLEM OF THE THIRD ORDER TO A BOUNDARY PROBLEM OF THE SECOND ORDER”. Matematichki Bilten 18, no. 1 (January 1, 1994): 87–92. Accessed August 14, 2026. https://bilten.smm.org.mk/index.php/bilten/article/view/1520.