@article{JLT_2000_10_2_a11,
     author = {F. Schwarz},
     title = {Canonical {Form} {Transformation} of {Second} {Order} {Differential} {Equations} with {Lie} {Symmetries}},
     journal = {Journal of Lie theory},
     pages = {411--433},
     year = {2000},
     volume = {10},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JLT_2000_10_2_a11/}
}