1. Laser-Cooled Ion Crystals
2. See, e.g., 2D Electron Systems on He and Other Cryogenic Substrates, ed. E. Andrei, Kluwer Academic Publishers, Dordrecht, The Netherlands, 1998
3. Electrons at the surface of quantum systems
4. M. A. Reed and W. P.Kirk, Nanostructure Physics and Fabrication, Academic Press, Boston, 1989
5. Coulomb clusters in a trap