%0 Journal Article
%A M. Filar
%T On a certain boundary problem for the equation \((\Delta + a^2)(\Delta + b^2) u = 0\)
%J Commentationes Mathematicae
%D 1976
%P  55-66
%V 19
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14708/cm.v19i1.5837/
%R 10.14708/cm.v19i1.5837
%G pl
%F 10_14708_cm_v19i1_5837