@article{LJM_1999_4_a7,
     author = {D. V. Tunitsky},
     title = {on contact equivalence of holomorphic {Monge--Amp\`ere} equations},
     journal = {Lobachevskii journal of mathematics},
     pages = {163--175},
     publisher = {mathdoc},
     volume = {4},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_1999_4_a7/}
}