1. I.V. Hertel, W. Stoll, Adv. At. Mol. Phys. 13, 113 (1978)
2. K. Bergmann, in Atomic and Molecular Beam Methods, edited by G. Scoles (Oxford Univ. Press, New York and Oxford, 1988), Vol. 1, p. 239
3. W.R. MacGillivray, M.C. Standage, Phys. Rep. 168, 1 (1988)
4. J.J. McClelland, in Experimental Methods in the Physical Sciences(Academic Press, San Diego, CA, USA, 1996), Vol. 29B, p. 145
5. W. Demtröder, Laser Spectroscopy, 2nd edn. (Springer, Heidelberg, New York, 1998)