1. A good overview is given in H. Demelt: Rev. Mod. Phys.62, 521 (1990). H. Walther:Laser Manipulation of Atoms and Ions, ed. by E. Arimondo, W.D. Phillips, F. Strumia (North-Holland, Amsterdam 1992) p. 569 R. Blümel, J.M. Chen, E. Peik, W. Quint, W. Schleich, Y.R. Shen, H. Walther: Nature (London)334, 309 (1988)
2. E. Arimondo, W.D. Phillips, F. Strumia (eds.):Laser Manipulation of Atoms and Ions (North-Holland, Amsterdam 1992) Special issue onLaser Cooling and Trapping of Atoms: J. Opt. Soc. Am. B.6 (Nov. 1989)
3. A good overview is given in W. Paul: Rev. Mod. Phys.62, 531 (1990)
4. K. Klueger, K. Moritz, W. Paul, U. Trinks: Nucl. Instrum. Methods228, 240 (1985)
5. N. Masuhara, J. Doyle, J. Sandberg, D. Kleppner, T. Greytak, H. Hess, G. Kochanski: Phys. Rev. Lett.61, 935 (1988)