%0 Journal Article %A W. Bartoszek %T On unrestricted products of (W) contractions %J Colloquium Mathematicum %D 2000 %P 163-170 %V 86 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-86-2-163-170/ %R 10.4064/cm-86-2-163-170 %G en %F 10_4064_cm_86_2_163_170