1. Electron optics and electron microscopy;Hawkes,1977
2. Theoretical consideration for an astigmatic lens in the electron microscope;Kanaya;Bull. Electrotech. Lab.,1958
3. Some electron optical properties of double-gap lenses;Schwartz;R.E.E.P.,1974
4. New rotation-free magnetic electron lenses;Juma,1974
5. New experimental electron microscopes with a rotation free projector system;Juma,1975