1. Proc. 3rd Int. Conf. on Electrostatic Accelerator Technology;Letournel,1981
2. Proc. 3rd Int. Conf. on Electrostatic Accelerator Technology;Thieberger,1981
3. Jahresbericht;Assmann,1975
4. G. Korschinek, W. Assmann and H. Münzer, these proceedings (6th Tandem Conf.), p. 82.
5. Jahresbericht;Kostka,1975