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Size and structure of the Chicxulub crater revealed by horizontal gravity gradients and cenotes; Hildebrand, A R; Pilkington,
M; Connors, M; Ortiz-Aleman, C; Chavez, R E. Nature vol. 376, no. 6539, 1995 p. 415-417,
https://doi.org/10.1038/376415a0 (GSC Cont.# 66994)