%0 Journal Article %A Janusz ZieliƄski %T On the algebra of constants of polynomial derivations in two variables %J Colloquium Mathematicum %D 2000 %P 267-269 %V 83 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-83-2-267-269/ %R 10.4064/cm-83-2-267-269 %G en %F 10_4064_cm_83_2_267_269