AVCI, H.; TUNÇ, E. Solvability of inhomogeneous boundary-value problems for fourth-order differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 9, p. 1263–1278, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2803. Acesso em: 5 dec. 2025.