Coherence length of an elongated condensate - A study by matter-wave interferometryM. Hugbart, J. A. Retter, F. Gerbier, A. F. Varón, S. Richard, J. H. Thywissen, D. Clément, P. Bouyer and A. AspectEur. Phys. J. D, 35 1 (2005) 155-163DOI: https://doi.org/10.1140/epjd/e2005-00056-2