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WikiPedia: Sự_kiện_tuyệt_chủng_Ordovic_–_Silur http://math.ucr.edu/home/baez/extinction http://www.nasa.gov/vision/universe/starsgalaxies/... http://arjournals.annualreviews.org/doi/abs/10.114... http://hannover.park.org/Canada/Museum/extinction/... http://www.bio.uu.nl/~palaeo/Paleobiologie/Maastri... https://web.archive.org/web/20080509124723/http://... https://web.archive.org/web/20190331090824/https:/... https://web.archive.org/web/20120715042430/http://...