Multiple solutions of a Schrödinger type semilinear equation Xiaochun Liu; Jianfu Yang — 2000 Commentationes Mathematicae Universitatis Carolinae Two nontrivial solutions are obtained for nonhomogeneous semilinear Schrödinger equations.
Asymptotic expansions for bounded solutions to semilinear Fuchsian equations. Liu, Xiaochun; Witt, Ingo — 2004 Documenta Mathematica