Algebraic spectral subspaces and automatic continuity Kjeld Bagger Laursen — 1988 Czechoslovak Mathematical Journal
Some remarks on the surjectivity spectrum of linear operators Kjeld Bagger Laursen; Pavla Vrbová — 1989 Czechoslovak Mathematical Journal
Asymptotic intertwining and spectral inclusions on Banach spaces Kjeld Bagger Laursen; Michael M. Neumann — 1993 Czechoslovak Mathematical Journal