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WikiPedia: Đỉnh dầu ftp://eia.doe.gov/pub/oil_gas/natural_gas/feature_... http://www.cis.org.au/media-information/opinion-pi... http://www.energy.gov.ab.ca/OilSands/pdfs/RPT_Chop... http://www.capp.ca/canadaIndustry/oil/Pages/defaul... http://www.macleans.ca/business/economy/article.js... http://www.mjtimes.sk.ca/Canada---World/Business/2... http://www.arabianbusiness.com/index.php?option=co... http://www.aspo-usa.com/archives/index.php?option=... http://www.blnz.com/news/2007/07/16/Study_Demand_o... http://www.boston.com/news/world/articles/2005/12/...