1. E. O. Achterberg, E. Y. de Aisenberg, F. D. Iglesias, A. E. Jech, J. A. Moragues, D. Otero, M. L. Perez, A. N. Proto-Otero, R. Requejo, J. J. Rossi, W. Scheuer, and J. F. Suarez, Proceedings of the International Conference on Electromagnetic Isotope Separators and the Techniques of their Application, Marburg, 1970 (Bundes- ministerium fur Technologie und Wissenschaft, rep. K 70–28) (1970), p. 108.
2. H. L. Adair and E. H. Kobisk, Treatise on Heavy-Ion Science(D. Allan Bromley, ed.), Vol. 7, Plenum Press, New York (1985), p. 119.
3. B. W. Allardyce and H. L. Ravn, Nucl. Instrum. Methods B26: 112 (1987).
4. I. Amarel, R. Beraas, J. Chaumont, R. Foucher, J. Jastrezbski, A. Johnson, R. Klapisch, and J. Teillac, Ark. Fys. 36: 77 (1967).
5. G. Anderson, Nucl. Instrum. Methods 28: 245 (1964).