1. P.K. Ghosh, Ion Traps (Oxford University Press, Oxford, 1995).
2. J. Dilling, Nucl. Instrum. Methods B 204, 492 (2003).
3. F.J. Currell, The Physics of Multiply and Highly Charged Ions, Vol. 1: Sources, Applications and Fundamental Processes (Kluwer Academic Publishers, Dordrecht, 2003).