Subpicosecond spatiotemporal pulse compression in a nonlinear defocusing material
N.C. Nielsen, T.H. zu Siederdissen, J. Kuhl, M. Schaarschmidt, J. Förstner, A. Knorr, S.W. Koch, H. Giessen, in: International Conference on Ultrafast Phenomena 2004, Technical Digest (CD) (Optical Society of America, 2004), 2004.

Temporal phase evolution during excitonic Rabi flopping in semiconductors
T. Höner zu Siederdissen, N.C. Nielsen, J. Kuhl, J. Förstner, A. Knorr, H. Giessen, in: International Quantum Electronics Conference and Photonic Applications Systems Technologies, OSA, 2004.

Temporal and spatial compression of near-resonant pulses in a nonlinear defocusing semiconductor 
N.C. Nielsen, J. Kuhl, M. Schaarschmidt, J. Förstner, A. Knorr, S.W. Koch, H. Giessen, in: Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), 2004.

Nonlinear light pulse propagation in Bragg-periodic multiple semiconductor quantum well samples: ultrafast switching of a resonant photonic band gap
M. Schaarschmidt, J. Förstner, A. Knorr, J.P. Prineas, N.C. Nielsen, J. Kuhl, G. Kithrova, H.M. Gibbs, H. Giessen, S.W. Koch, in: Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, OSA, 2004.

Self-consistent Projection Operator Theory of Intersubband Absorbance in Semiconductor Quantum Wells
I. Waldmüller, J. Förstner, A. Knorr, in: K. Morawetz (Ed.), Nonequilibrium Physics at Short Time Scales, Springer Berlin Heidelberg, Berlin, Heidelberg, 2004.