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WikiPedia: Bọ_ba_thùy http://www.britannica.com/EBchecked/topic/605346 http://firstlifeseries.com/learn-more/ http://mdbourrie.googlepages.com/trilobites http://www.westernta.com/ http://www.cornellcollege.edu/geology/courses/Gree... http://www1.newark.ohio-state.edu/Professional/OSU... http://www.trilobites.info/ http://www.fossilmuseum.net/Tree_of_Life/PhylumArt... //dx.doi.org/10.1017%2FS0263593303000105 //dx.doi.org/10.1511%2F2004.49.944