%0 Journal Article %A M. Parmenter %T Exact covering systems for groups %J Fundamenta Mathematicae %D 1984 %P 133-136 %V 123 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-123-2-133-136/ %R 10.4064/fm-123-2-133-136 %G en %F 10_4064_fm_123_2_133_136