1. ‘On the system of equation from the theory of nonlinear viscoplasticity’, preprint TH Darmstadt, 1989.
2. ‘Global existence and boundedness of large solutions to nonlinear equations of viscoplasticity with hardening’, preprint TH Darmstadt, 1993.
3. and , ‘Constitutive Equations for Elastic-Viscoplastic Strain-Hardening Materials’, J. Appl. Mech. (1975).
4. ‘Global in time existence of solutions to the constitutive model of Bodner-Partom with isotropic hardening’, preprint TH Darmstadt, 1993.
5. ‘Existence of large solutions to the quasistatic problem for a three-dimensional Maxwell material’, preprint TH Darmstadt, 1993.