H. U. Mueller

Langerak, C. J., Li, L., Van Bockstal, L., Ardavan, A., van de Pol, M., van der Meer, A. F. G., … Singleton, J. (1998). The polaron effect in GaAs-(Al,Ga)As studied with a pulsed-field magnet: Free-electron-laser combination. Physica B, 246, 400-403. https://doi.org/10.1016/s0921-4526(97)00943-5 (Original work published 1998)

Van Bockstal, L., Li, L., Langerak, C. J., van de Pol, M., De Keyser, A., van der Meer, A. F. G., … von Ortenberg, M. (1998). Infrared spectroscopy with a pulsed high field magnet at a free electron laser. Physica B, 246, 208-212. https://doi.org/10.1016/s0921-4526(97)00944-7 (Original work published 1998)