1. Stability of a partially compensated electron beam
2. L.J. Laslett, A.M. Sessler, D. Mohl, Preprint LBL-1072 (1972).
3. G.I. Budker, G.I. Dimov, G.V. Rosljakov, V.E. Chuprijanov and V.G. Shamovsky, Preprint INP 77-51, Novosibirsk (1977) (in Russian).