@article{IM_1992__108_2_143994,
     author = {P. D'Ancona and S. Spagnolo},
     title = {Global sovability for the degenerate {Krichhoff} equation with real anlytic data.},
     journal = {Inventiones mathematicae},
     pages = {247--262},
     publisher = {mathdoc},
     volume = {108},
     number = {2},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM_1992__108_2_143994/}
}