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References
Khanna,G., Baker, J. et al. Inspiraling Black Holes: The Close Limit. Physical Review Letters 83, 3581 - 3584 1999.
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Ball, P. When holes collide. Nature (1999). https://doi.org/10.1038/news991111-3
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DOI: https://doi.org/10.1038/news991111-3