%0 Journal Article
%A N. S. Grigor'ev
%T The Ursell Method for apriori Estimation of the Solution of the Neumann Problem for the Helmholtz Equation
%J Zapiski Nauchnykh Seminarov POMI
%D 1974
%P 85-154
%V 42
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1974_42_a5/
%G ru
%F ZNSL_1974_42_a5