@article{EJDE_1999__1999__a139,
     author = {Pulkina, L.S.},
     title = {A non-local problem with integral conditions for hyperbolic equations},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {1999},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a139/}
}