Examples of disks in E3/G which cannot be approximated by P-liftable disks
Woodruff, Edythe
Fundamenta Mathematicae, Tome 85 (1974), p. 117-136 / Harvested from The Polish Digital Mathematics Library
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Publié le : 1974-01-01
EUDML-ID : urn:eudml:doc:214790 
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     author = {Edythe Woodruff},
     title = {Examples of disks in $E^3$/G which cannot be approximated by P-liftable disks},
     journal = {Fundamenta Mathematicae},
     volume = {85},
     year = {1974},
     pages = {117-136},
     zbl = {0294.54009},
     language = {en},
     url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv86i1p9bwm}
}

Woodruff, Edythe. Examples of disks in $E^3$/G which cannot be approximated by P-liftable disks. Fundamenta Mathematicae, Tome 85 (1974) pp. 117-136. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv86i1p9bwm/