%0 Journal Article %A Vlastimil Pták %T An operator-theoretic approach to theorems of the Pick-Nevanlinna and carathéodory types. %J Manuscripta mathematica %D 1988 %P 131-144 %V 62 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1988__62_3_155336/ %F MM2_1988__62_3_155336