%0 Journal Article
%A Díaz, J. B.
%T Reflection principles for the iterated Helmholtz equation.
%J Collectanea mathematica
%D 1975
%P 253-266
%V 26
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CLTM_1975_1975_1_a19/
%G en
%F CLTM_1975_1975_1_a19