%0 Journal Article
%A V. N. Gol'dberg
%T The occurrence of discontinuities which arise when extending solutions of nonlinear mixed problems for the string equation
%J Doklady Akademii Nauk
%D 1967
%P 1229-1232
%V 176
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_176_6_a4/
%G ru
%F DAN_1967_176_6_a4