@article{SM_2009_200_11_a4,
     author = {D. V. Tunitsky},
     title = {On some categories of {Monge-Amp\`ere} systems of equations},
     journal = {Sbornik. Mathematics},
     pages = {1681--1714},
     publisher = {mathdoc},
     volume = {200},
     number = {11},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2009_200_11_a4/}
}