1. A hexapole spherical aberration corrector;Beck;Optik,1979
2. Studies on sextupole correctors;Crewe;Optik,1980
3. Asystem for the correction of axial aperture aberrations in electron lenses;Crewe;Optik,1982
4. Some Chicago aberrations;Crewe;Microsc. Microanal.,2002
5. Limitation of sextupole correctors;Crewe;Optik,1980