1. Die optischen Hilfsmittel der Mikroskopie;Abbe,1878
2. Requirements contributing to the design of devices used in correcting electron lenses;Archard;Br. J. Appl. Phys.,1954
3. A quadrupole octopole corrector for a 100 kV STEM;Beck;Proc. Ann. Meeting EMSA,1974
4. A hexapole spherical aberration corrector;Beck;Optik,1979
5. Erprobung eines sphaerisch korrigierten Elektronenmikroskops;Bernhard;Optik,1980