@article{BUMI_2006_8_9B_3_a4,
     author = {De Donno, Giuseppe and Oliaro, Alessandro},
     title = {Hypoellipticity and local solvability of anisotropic {PDEs} with {Gevrey} nonlinearity},
     journal = {Bollettino della Unione matematica italiana},
     pages = {583--610},
     year = {2006},
     volume = {Ser. 8, 9B},
     number = {3},
     zbl = {1121.35029},
     mrnumber = {2274114},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2006_8_9B_3_a4/}
}