[3] Munro E. CAD of electron lenses by the finite element[A]. Hawkes P W. In Image Processing and CAD in Electron Optics[C]. New York: Academic Press, 1973. 284-323.
[5] Zhang Zhi-quan, Zhou Li-wei, JIN Wei-qi, et al. Optimization design of image tubes with electrostatic focusing[A]. International Symposium on Photoelectronic Detection and Imaging: Technology and Application'93, SPIE[C]. 1993, 1982.238-244.