@article{10_4064_fm_86_2_117_136,
     author = {Edythe Woodruff},
     title = {Examples of disks in $E^3${/G} which cannot be approximated by {P-liftable} disks},
     journal = {Fundamenta Mathematicae},
     pages = {117--136},
     publisher = {mathdoc},
     volume = {86},
     number = {2},
     year = {1974},
     doi = {10.4064/fm-86-2-117-136},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-86-2-117-136/}
}