%0 Journal Article %A Edythe Woodruff %T Examples of disks in $E^3$/G which cannot be approximated by P-liftable disks %J Fundamenta Mathematicae %D 1974 %P 117-136 %V 86 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-86-2-117-136/ %R 10.4064/fm-86-2-117-136 %G en %F 10_4064_fm_86_2_117_136