%0 Journal Article
%A Grammatikopoulos,  Myron.K.
%A Hristov,  Tzvetan D.
%A Popivanov,  Nedyu I.
%T Singular solutions to Protter's problem for the 3-D wave equation involving lower order terms
%J Electronic journal of differential equations
%D 2003
%V 2003
%U http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a46/
%G en
%F EJDE_2003__2003__a46