2 Dec 1997 / ``Structure and Evolution of the Intergalactic Medium from QSO Absorption Line Systems'' eds. P. Petitjean and S. Charlot (Editions Frontières, Paris, 1997), 117-122
30 Sep 1997 / ``Structure and Evolution of the Intergalactic Medium from QSO Absorption Line Systems'' eds. P. Petitjean and S. Charlot (Editions Frontieres, Paris, 1997), 339-344