1. G. Slodzian, Nat. Bur. Stand. U.S. Spec. Publ. 427 (1975)
2. H. Liebl, in Low Energy Ion Beams 1977, K.G. Stephens et al., eds. Conf. Ser. 38, The Inst. of Phys. (1978)
3. F.G. Rüdenauer, Int. J. Mass Spectrom. Ion Phys. 6, 309 (1971)
4. G. Slodzian, in Applied-Charged Particle Optics, A. Septier, ed., Academic Press (1980)
5. S. Taya, PhD Thesis, Osaka Univ., Japan (March 1978)