Becker, Luan, Poreda, Robert J.; Hunt, Andrew G.; Bunch, Theodore Ec & Rampino, Michael (2001). Impact Event at the Permian-Triassic Boundary: Evidence from Extraterrestrial Noble Gases in Fullerenes. Science291 (5508): 1530–1533. PMID11222855. DOI: 10.1126/science.1057243.
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ncbi.nlm.nih.gov
Becker, Luan, Poreda, Robert J.; Hunt, Andrew G.; Bunch, Theodore Ec & Rampino, Michael (2001). Impact Event at the Permian-Triassic Boundary: Evidence from Extraterrestrial Noble Gases in Fullerenes. Science291 (5508): 1530–1533. PMID11222855. DOI: 10.1126/science.1057243.