1. E. Munro, Computer-Aided Design Methods in Electron Optics, PHD Thesis, University of Cambridge, England, October 1971
2. B. Lencová, “The use of the first-order FEM for the compuation of magnetic electron lenses”, Proc SPEE, Charged Particle Optics II, Vol. 2858, 1996, p34–45
3. B. Lencová and M. Lenc, “The computation of open electron lenses by coupled finite element and boundary integral methods”, Optik, Vol. 68, No. 1, 1984, p37–60
4. B. Lencová, “Unconventional lens computation”, Journal of Microscopy, Vol. 179, Pt. 2, August 1995, p185–190
5. J. D. Jackson, Classical Electrodynamics, 2nd edition, John Wiley and Sons, NY, 1975, section 5.5, pl77–8