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WikiPedia: Giá_dầu http://tonto.eia.doe.gov/ask/crude_types1.html //www.worldcat.org/issn/0362-4331 https://www.forbes.com/sites/ucenergy/2020/04/03/w... https://www.ft.com/content/bc938195-82d3-43eb-b031... https://www.marketwatch.com/story/us-oils-may-cont... https://www.nytimes.com/2020/03/06/business/stock-... https://www.nytimes.com/2020/03/31/business/energy... https://oilprice.com/oil-price-charts https://www.washingtonpost.com/business/2020/03/09... https://www.washingtonpost.com/world/2020/03/09/co...