1. The Theoretical Resolution Limit of the Electron Microscope
2. P. Schiske, in: P. Hawkes (Ed.), Image Processing and Computer-Aided Design in Electron Optics, Academic Press, New York, 1973, p. 82.
3. W.O. Saxton, in: Advances in Electronics and Electron Physics, Computer Techniques for Image Processing in Electron Microcopy, Academic Press, New York, 1978.