@article{CMFD_2003_1_a0,
     author = {W. Balser},
     title = {Summability of {Formal} {Power-Series} {Solutions} of {Partial} {Differential} {Equations} with {Constant} {Coefficients}},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {5--17},
     publisher = {mathdoc},
     volume = {1},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2003_1_a0/}
}