TY - JOUR AU - Lipman, Joe TI - Definition of Affine Geometry by a Group of Transformations JO - Canadian mathematical bulletin PY - 1961 SP - 265 EP - 278 VL - 4 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-030-1/ DO - 10.4153/CMB-1961-030-1 ID - 10_4153_CMB_1961_030_1 ER -