Hayashi, Nakao, and Pavel l. Naumkin. “Existence of Asymptotically Free Solutions for Quadratic Nonlinear Schrödinger Equations in 3d”. CUBO, A Mathematical Journal 9, no. 1 (April 1, 2007): 27–37. Accessed February 19, 2026. https://cubo.ufro.cl/index.php/cubo/article/view/1597.