... algorithm

Based on observations obtained at the Canada-France-Hawaï Telescope (CFHT) which is operated by the National Research Council of Canada (NRCC), the Institut des Sciences de l'Univers (INSU) of the Centre National de la Recherche Scientifique (CNRS) and the University of Hawaï (UH), and on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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...Soucail et al. (1987b)

We use thereafter the notations of Soucail et al. (1987b) and Mellier et al. (1998) to refer to the details in our images.

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