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\bibitem{Hildebrand1994} Hildebrand, A. R., Connors, M., Pilkington, M., Ortiz-Aleman, C., \& Chavez, RE. (1994). Size and Structure of the Chicxulub Crater. \textit{Revista de la Sociedad Mexicana de Paleontologia}, \textit{7}, 59--68.

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