%0 Journal Article %A J. Hempel %A D. McMillan %T Covering three-manifolds with open cells %J Fundamenta Mathematicae %D 1969 %P 99-104 %V 64 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-64-1-99-104/ %R 10.4064/fm-64-1-99-104 %G en %F 10_4064_fm_64_1_99_104