M. Randler, V. Frey, J. Brill, and E. Lüder. ITG-Fachbericht 165, Proceedings Displays and Vacuum Electronics, Garmisch-Partenkirchen, 2001, pp. 121-125, (2001)
J. Brill, M. Randler, V. Frey, and E. Lüder. ITG-Fachbericht 165, Proceedings Displays and Vacuum Electronics, Garmisch-Partenkirchen, 2001, pp. 133-136, (2001)