@article{10_4153_CMB_1961_030_1,
     author = {Lipman, Joe},
     title = {Definition of {Affine} {Geometry} by a {Group} of {Transformations}},
     journal = {Canadian mathematical bulletin},
     pages = {265--278},
     year = {1961},
     volume = {4},
     number = {3},
     doi = {10.4153/CMB-1961-030-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-030-1/}
}