1. P. Michel, F. Gabriel, E. Grosse, P. Evtushenko, T. Dekorsy, M. Krenz, M. Helm, U. Lehnert, W. Seidel, R. Wünsch, D. Wohlfarth, and A. Wolf, in Proceedings of the 26th international FEL conference 2004, Trieste, Italy (2004), p. 8.
2. W. Seidel, E. Cizmar, O. Drachenko, M. Helm, M. Justus, U. Lehnert, P. Michel, M. Ozerov, H. Schneider, R. Schurig, D. Stehr, M. Wagner, S. Winnerl, D. Wohlfarth, S. Zvyagin, S. C. Kehr, and L. M. Eng, in Proceedings of the 30th international FEL conference, Gyeongju, Korea (2008), p. 8.
3. Anisotropy Contrast in Phonon-Enhanced Apertureless Near-Field Microscopy Using a Free-Electron Laser
4. Near-field examination of perovskite-based superlenses and superlens-enhanced probe-object coupling
5. Intersublevel Spectroscopy on Single InAs-Quantum Dots by Terahertz Near-Field Microscopy