On multi-lump solutions to the non-linear Schrödinger equation. Magnus, Robert — 1998 Electronic Journal of Differential Equations (EJDE) [electronic only]
Division Formulas for Holomorphic Mappings with Values in Banach Algebra. Robert Magnus — 1994 Mathematica Scandinavica
On the Multiplicity of an Analytic Operator-Valued Function. Robert Magnus — 1995 Mathematica Scandinavica