Martinez, A. L. M., C. A. Pendeza Martinez, G. M. Bressan, R. M. Souza, and E. W. Stiegelmeier. “Multiple Solutions for a Sixth Order Boundary Value Problem”. Trends in Computational and Applied Mathematics 22, no. 1 (April 17, 2021): 1–12. Accessed July 3, 2024. https://tema.sbmac.org.br/tema/article/view/1466.