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0. Klemperer and M. E. Barnett, Electron Optics, 3rd ed., Cambridge Univ., London, 1971.[2] P. Grivet and A. Septier, Electron Optics, 2nd ed., Pergamon Prese, Oxford, 1972.[3] A. P. Banford, The Transport of Charged Particle Beams, Spon, London, 1966.