@article{10_4153_CMB_1974_099_6,
     author = {Page, S.},
     title = {When {Flats} are {Torsion} {Free}},
     journal = {Canadian mathematical bulletin},
     pages = {559--561},
     year = {1974},
     volume = {17},
     number = {4},
     doi = {10.4153/CMB-1974-099-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-099-6/}
}