%0 Journal Article %A Mi Zhou %A George Anastassiou %T Representation formulae for (C₀) m-parameter operator semigroups %J Annales Polonici Mathematici %D 1996 %P 247-272 %V 63 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-63-3-247-272/ %R 10.4064/ap-63-3-247-272 %G en %F 10_4064_ap_63_3_247_272