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\bibitem{Hildebrand1995} Hildebrand, A. R., Pilkington, M., Halpenny, J. F., Ortiz-Aleman, C., Chavez, R. E., Urrutia-Fucugauchi, J., Connors, M., Graniel-Castro, E., Camara-Zi, A., \& Vasquez, J. (1995). Imaging the buried Chicxulub crater with gravity gradients and cenotes.\textit{30}, 519.

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