@article{SM_2010_201_5_a0,
     author = {A. V. Aminova and N. A.-M. Aminov},
     title = {The projective geometric theory of systems of second-order differential equations: straightening and symmetry theorems},
     journal = {Sbornik. Mathematics},
     pages = {631--643},
     publisher = {mathdoc},
     volume = {201},
     number = {5},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2010_201_5_a0/}
}