%0 Journal Article %A Li Chen %T On unitary equivalence of quasi-free Hilbert modules %J Studia Mathematica %D 2009 %P 87-98 %V 195 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm195-1-5/ %R 10.4064/sm195-1-5 %G en %F 10_4064_sm195_1_5