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General Relativity and Gravitation, 1989: Proceedings of the 12th International Conference on General Relativity and Gravitation/en-ca/general-relativity-and-gravitation-1989-proceedings-of-the-12th-international-conference-on-general-relativity-and-gravitation/6A31851B-8B92-456F-B6E0-D91DEAA11BC8.html6A31851B-8B92-456F-B6E0-D91DEAA11BC8
General Relativity and Gravitation, 1989: Proceedings of the 12th International Conference on General Relativity and Gravitation