1. Proc. 8th. Int. EMIS Conf.;Foucher,1973
2. 11th ECPM;Laisne,1974
3. 7th Int. Conf. on Cyclotrons Zürich;Bimbot,1975
4. Les lentilles quadrupolaires electrostatiques
5. R. L. Mills and A. M. Sessler, MURA Rept. 433, Midwestern University, Madison, Wisconsin, U.S.A.