%0 Journal Article %A Blundon, W. J. %T A Three-Fold Non-Lattice Covering %J Canadian mathematical bulletin %D 1977 %P 29-31 %V 20 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1977-005-1/ %R 10.4153/CMB-1977-005-1 %F 10_4153_CMB_1977_005_1