“Persistent Homoclinic Orbits for a Perturbed Cubic-quinitic Nonlinear Schrodinger Equation”, J. Part. Diff. Eq., vol. 15, no. 2, pp. 6–36, May 2002, Accessed: Feb. 26, 2026. [Online]. Available: https://www.global-sci.com/index.php/jpde/article/view/14858