@article{SM_2006_197_7_a0,
     author = {A. V. Aminova and N. A. Aminov},
     title = {Projective geometry of systems of second-order differential equations},
     journal = {Sbornik. Mathematics},
     pages = {951--975},
     publisher = {mathdoc},
     volume = {197},
     number = {7},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_7_a0/}
}