The Letelier-Gal'tsov spacetime revisited
  Contrary to a recent claim by Anderson ["The Mathematical Theory of Cosmic Strings", I.O.P. Publishing, Bristol 2003], we show that the Letelier-Gal'tsov metric does represent a system of crossed straight infinite cosmic strings moving with arbitrary constant velocities. 
G. Clement, D.V. Gal'tsov and P.S. Letelier