PARASIDIS, I.N. Extension method for a class of loaded differential equations with nonlocal integral boundary conditions. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 96, n. 4, p. 58–68, 2019. DOI: 10.31489/2019m4/58-68. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/336. Acesso em: 4 sep. 2025.