%0 Journal Article %A E.M. Stein %A Detlef Müller %A F. Ricci %T Marcinkiewicz multipliers and multi-parameter structure on Heisenberg (-type) groups, I. %J Inventiones mathematicae %D 1995 %P 199-234 %V 119 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1995__119_3_144254/ %F IM_1995__119_3_144254