HST/NICMOS2 coronagraphic observations of the circumstellar environment of three old PMS stars: HD 100546, SAO 206462 and MWC 480J. C. Augereau, A. M. Lagrange, D. Mouillet and F. MénardA&A, 365 2 (2001) 78-89DOI: https://doi.org/10.1051/0004-6361:20000328