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\bibitem{Hildebrand1995} Hildebrand, A. R.,, Connors, M., Pilkington, M., Ort{\'\i}z Alem{\'a}n, C., \& Chavez, R.E. (1995). Size and Structure of the Chicxulub Crater Revealed by Horizontal Gravity Gradients and Cenotes.\textit{376,}, 415--417.

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