@article{SM_1973_21_2_a3,
     author = {B. R. Vainberg},
     title = {On~exterior elliptic problems polynomially depending on a~spectral parameter, and the asymptotic behavior for large time of solutions of nonstationary problems},
     journal = {Sbornik. Mathematics},
     pages = {221--239},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_21_2_a3/}
}