%0 Journal Article %A Page, S. %T When Flats are Torsion Free %J Canadian mathematical bulletin %D 1974 %P 559-561 %V 17 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-099-6/ %R 10.4153/CMB-1974-099-6 %F 10_4153_CMB_1974_099_6