%0 Journal Article %A G. F. Maslennikova %T The Neumann problem for the Helmholtz operator in the exterior of a thin body of revolution %J Differencialʹnye uravneniâ %D 1984 %P 316-324 %V 20 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1984_20_2_a15/ %G ru %F DE_1984_20_2_a15