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\bibitem{Hildebrand1995} Hildebrand, A. R., Connors, M., Pilkington, M., Ortiz-Aleman, C., and Chavez, R. E. (1995). Chicxulub Crater Size and Structure As Revealed by Horizontal Bouguer Gravity Gradients and Cenote Distribution.\textit{26}, 603--604.

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