1. Lens optimization by direct application of the calculus of variation;Moses,1973
2. Existenzbereiche Rotations Symmetrischer Elekronenlinsen;Trenter;Optik,1959
3. A new approach to electron optical optimization;Szilagyi;Optik,1977
4. A dynamic programming search for magnetic field distribution;Szilagyi;Optik,1977
5. A dynamic programming search for electrostatic immersion lenses with minimum spherical aberration;Szilagyi;Optik,1978