TY - JOUR AU - Pulkina, L.S. TI - A non-local problem with integral conditions for hyperbolic equations JO - Electronic Journal of Differential Equations PY - 1999 VL - 1999 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a90/ LA - en ID - EJDE_1999__1999__a90 ER -