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General Relativity and Gravitation > 2011 > 43 > 9 > 2499-2507
General Relativity and Gravitation > 1998 > 30 > 4 > 535-543
General Relativity and Gravitation > 2011 > 43 > 9 > 2499-2507
General Relativity and Gravitation > 1998 > 30 > 4 > 535-543