1991
- Ulbrich, U., und M. Ponater, 1991: The impact of improved parameterization in the T21 Hamburg model on the representation of the energy cycle of stationary and transient atmospheric waves. Annales Geophysicae, Suppl. to Vol. 9, C 189-C190.
- Ulbrich, U., and P. Speth, 1991: Baroclinic instability and the atmospheric energy cycle. IUGG XX General assembly, IAMAP abstracts, 121.