Ulbrich, U. und P. Speth, 1989: The role of nonlinear energy conversions between stationary and transient waves within zthe energy cycle of the atmosphere. IAMAP 89, Abstracts Vol. 2, ND25.
Ulbrich, U., und P. Speth, 1989: Nichtlineare Energieumwandlungen zwischen stationären und transienten atmosphärischen Wellen. Annalen der Meteorologie, 26, 164 - 165.
Ulbrich, U., M. Barbulescu, and P. Speth, 1989: Traveling waves in the atmosphere and in the T21 Hamburg model. International conference on modelling of global climate change and variability, Abstracts, 41.
