Alekseev, G. A.Griffiths, J. B.2004-12-032004-12-0320012001http://hdl.handle.net/2003/171510.17877/DE290R-11489enThe American Physical SocietyPhysical Review Letters530Solving the Characteristic Initial-Value Problem for Colliding Plane Gravitational and Electromagnetic Waves10.1103/PhysRevLett.87.221101article (journal)