1. Achromatic quadrupole lenses
2. ON THE FEASIBILITY OF MICROSCOPY WITH HIGH-ENERGY HEAVY IONS
3. F.W. Martin and R. Goloskie, to be published.
4. Quadrupoles in electron lens design;Hawkes,1970
5. Suppl. 7 to Advan. Electron. Electron Phys., p. 65.