%0 Journal Article %A B. R. Vainberg %T On~exterior elliptic problems polynomially depending on a~spectral parameter, and the asymptotic behavior for large time of solutions of nonstationary problems %J Sbornik. Mathematics %D 1973 %P 221-239 %V 21 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1973_21_2_a3/ %G en %F SM_1973_21_2_a3