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WikiPedia: Dòng thời gian http://www.spacex.com/news/2016/09/01/anomaly-upda... https://commons.wikimedia.org/wiki/Timeline?uselan... http://www.bl.uk/timeline http://www.port-royal-des-champs.eu/frise https://www.wikidata.org/wiki/Q186117#identifiers https://d-nb.info/gnd/4190631-7 http://www.informatik.uni-leipzig.de/~duc/Dict/ https://id.loc.gov/authorities/subjects/sh85025413 https://web.archive.org/web/20170216160231/http://... https://archive.org/details/cartographiesoft0000ro...