@article{10_4153_CMB_2006_018_7,
     author = {Atkins, Richard},
     title = {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}},
     journal = {Canadian mathematical bulletin},
     pages = {170--184},
     year = {2006},
     volume = {49},
     number = {2},
     doi = {10.4153/CMB-2006-018-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2006-018-7/}
}