ONYEJEKWE, O. O. Integral formulations for 1-D Biharmonic and Second Order Coupled Linear and Nonlinear Boundary Value Problems. Annals of Mathematics and Physics, [S. l.], v. 1, n. 1, p. 001–004, 2018. DOI: 10.17352/amp.000001. Disponível em: https://www.peertechzpublications.us/amp/article/view/AMP-1-101. Acesso em: 10 jan. 2025.