GEORGIEVSKA, Slobodanka S. A BOUNDARY PROBLEM OF THE SIXTH ORDER AS A PRODUCT OF BOUNDARY PROBLEMS OF THE SECOND AND THE THIRD ORDERS. Matematichki Bilten, [S. l.], v. 26, n. 1, p. 117–124, 2002. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1658. Acesso em: 14 aug. 2026.