1. Al-Hilly , S.M. Mulvey , T. 1982 Wide-angle projector systems for the TEM 103 106
2. Field evaluation from potentials calculated by the finite element method for ray tracing: the slice method;Barth;Nucl. Instr. Meth. Phys. Res.,1990
3. Elkamali , H.H. Mulvey , T. 1980 A wide-angle projection system Electron Microscopy 1980 P. Brederoo G. Boom Vol. I 7 75
4. Lenc , M. Lencová , B. 1984 Saturated single polepiece objective lenses Electron Microscopy 1984 Á. Csanády P. Röhlich D. Szabó Vol. I 27 28
5. Accuracy of FEM for the computation of axisymmetric magnetic electron lenses;Lencová;J. Japan Soc. Appl. Electromagnetics.,1994