@article{ZNSL_1989_170_a16,
     author = {H. S. Shapiro},
     title = {Local solvability of {PDE} with constant coefficients},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {314--320},
     publisher = {mathdoc},
     volume = {170},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1989_170_a16/}
}