Kuhl, J. Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;
Pau, S., Kuhl, J., Scholz, F., Haerle, C., Khan, M. A., & Sun, C. J. (1998). Study of hexagonal GaN by femtosecond-excitation correlation measurement and degenerate four-wave-mixing. Springer Series in Chemical Physics, 63, 251-253.