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Classification of the Neutron Transport Operator and Analysis of its Spectral Radius
Transp. Theory and Stat. Phys. 22(6), 861-869 (1993)

Extensions of Operators Leaving the Spectrum Invariant
J. Math. Anal. Appl. 187(3), 864-877 (1994)

Multiplikative Störungen von C0-Halbgruppen
Dissertation, TU Berlin, 1994, Berlin

Some Perturbation Results for Semigroups
Arch. Math. 64, 475-483 (1995)

Functional Calculi in Semigroup Theory
McBride/Roach: Recent Developments in Evolution Equations; Longman, 175-179 (1995)

Multiplikative Perturbations in Semigroup Theory with the (Z)-condition
Semigroup Forum 52, 197-211 (1996)

Evolution Families and Generators of Semigroups
Houst. J. Math. 23, 357-383 (1997)

Duality Theory for Volterra Integral Equations
J. Math. Anal. Appl. 230, 112-134(1999)

On the Relationship of Perturbed Semi-groups and their Generators
Semigroup Forum 61, 283-297 (2000)

Admissibility of Control Operators for Solution Families to Volterra Integral Equations
SIAM J. Control Optim 38, 1323-1333 (2000)


Perturbation Results for Evolution Equations

Multiplier Theorems on Vector-valued Besov spaces
Preprint (with Lutz Weis);

Observation Operators for Evolutionary Integral Equations

Remarks on continuous, non-differentiable flows

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