1. Several general discussions can be found in Atom Interferometry, edited by P. Berman (Academic Press, San Diego, 1997), the contributions of C. Bordé, of U. Sterr et al. and of B. Young et al. are particularly relevant to our work
2. J. Dowling, J. Gea-Banacloche, in Advances in Atomic, Molecular, and Optical Physics, edited by B. Bederson, H. Walther (Academic Press HBJ, Boston, 1996), Vol. 37, pp. 1-94, and references therein
3. V. Balykin, in Advances in Atomic, Molecular and Optical Physics, edited by B. Bederson, H. Walther (Academic Press, Boston, 1998), Vol. 41, pp. 182-260, and references therein
4. E. Hinds, I. Hughes, J. Phys. D: Appl. Phys. 32, R119 (1999), and references therein
5. A. Landragin, G. Labeyrie, C. Henkel, R. Kaiser, N. Vansteenkiste, C.I. Westbrook, A. Aspect, Opt. Lett. 21, 1591 (1996)