General Relativity and Gravitation
General Relativity and Gravitation > 2001 > 33 > 3 > 395-404
General Relativity and Gravitation > 2001 > 33 > 7 > 1181-1195
General Relativity and Gravitation > 2001 > 33 > 3 > 395-404
General Relativity and Gravitation > 2001 > 33 > 7 > 1181-1195