%0 Journal Article %A Rovnyak, James %T Operator-valued analytic functions of constant norm %J Czechoslovak Mathematical Journal %D 1989 %P 165-168 %V 39 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102288/ %R 10.21136/CMJ.1989.102288 %G en %F 10_21136_CMJ_1989_102288