Branching laws for some unitary representations of SL ( 4 , ℂ ) . Ørsted, Bent; Speh, Birgit — 2008 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Unitary Representations of Gl(n,IR) with Non-trivial (..., K)-Cohomology. Birgit Speh — 1983 Inventiones mathematicae
Automorphic representations and Lefschetz numbers Jürgen Rohlfs; Birgit Speh — 1989 Annales scientifiques de l'École Normale Supérieure
Representations with cohomology in the discrete spectrum of subgroups of SO ( n , 1 ) ( Z ) and Lefschetz numbers Jürgen Rohlfs; Birgit Speh — 1987 Annales scientifiques de l'École Normale Supérieure