%0 Journal Article %A Bernd Carl %A Andreas Defant %A Doris Planer %T Weyl numbers versus $Z$-Weyl numbers %J Studia Mathematica %D 2014 %P 233-250 %V 223 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4064/sm223-3-4/ %R 10.4064/sm223-3-4 %G en %F 10_4064_sm223_3_4