@article{IM_1995__120_2_144279,
     author = {Francois Treves and Paulo D. Cordaro},
     title = {Necessary and sufficient conditions for the local solvability in hyperfunctions of a class of systems of complex vector fields.},
     journal = {Inventiones mathematicae},
     pages = {339--360},
     publisher = {mathdoc},
     volume = {120},
     number = {2},
     year = {1995},
     zbl = {0834.35004},
     url = {http://geodesic.mathdoc.fr/item/IM_1995__120_2_144279/}
}