@article{10_4153_CMB_1964_021_9,
     author = {Lambek, J.},
     title = {A {Module} is {Flat} if and {Only} if its {Character} {Module} {isInjective}},
     journal = {Canadian mathematical bulletin},
     pages = {237--243},
     year = {1964},
     volume = {7},
     number = {2},
     doi = {10.4153/CMB-1964-021-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-021-9/}
}