@article{IM2_1997_61_5_a6,
     author = {D. V. Tunitsky},
     title = {On the global solubility of the {Monge--Ampere} hyperbolic equations},
     journal = {Izvestiya. Mathematics },
     pages = {1069--1111},
     publisher = {mathdoc},
     volume = {61},
     number = {5},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1997_61_5_a6/}
}