TY - JOUR AU - Atkins, Richard TI - The Geometry of d 2 y 1/dt 2 = f (y, ẏ, t) and d 2 y 2/dt 2 = g(y, ẏ, t), and Euclidean Spaces JO - Canadian mathematical bulletin PY - 2006 SP - 170 EP - 184 VL - 49 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-2006-018-7/ DO - 10.4153/CMB-2006-018-7 ID - 10_4153_CMB_2006_018_7 ER -