%0 Journal Article %A D. Przeworska-Rolewicz %A S. Rolewicz %T On operators with a finite d-characteristic %J Studia Mathematica %D 1964 %P 257-270 %V 24 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-24-3-257-270/ %R 10.4064/sm-24-3-257-270 %G en %F 10_4064_sm_24_3_257_270