GEORGIEVSKA, Slobodanka S. A BOUNDARY PROBLEM OF THE THIRD AND FOURTH ORDERS AS A PRODUCT OF BOUNDARY PROBLEMS OF THE SECOND ORDER. Matematichki Bilten, [S. l.], v. 19, n. 1, p. 53–64, 1995. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1557. Acesso em: 14 aug. 2026.