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3. L. A. Baranova and S. Ya. Yavor, Electrostatic Electron Lenses (Nauka, Moscow, 1986).
4. A. A. Zhigarev and G. G. Shamaeva, Electron-Beam and Photoelectron Devices (Vysshaya Shkola, Moscow, 1982).
5. M. Szilagyi, Electron and Ion Optics (Plenum, New York, 1988).