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| 2. | Tusk, Donald(20140421)。A united Europe can end Russia's energy stranglehold。 |
| 3. | Eurostat。Energy from renewable sources 2016，http://ec.europa.eu/eurostat/statistics_explained/index.php/Energy_from_renewable_sources。 |
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| 5. | Eurostat。Energy Dependence Rate--all products 2013，http://ec.europa.eu/eurostat/statisticsexplained/index.php/File:Energy_dependency_rate_all_products,_2013_(%25_of_net_imports_in_gross_inland_consumption_and_bunkers,_based_on_tonnes_of_oil_equivalent)_YB 15.png。 |
| 6. | German exports topped 30BN M3 in 2015, in Natural Gas Europe，http://ec.europa.eu/eurostat/documents/2995521/7150363/8-04022016-AP-EN.pdf/c92466d9-903e-417c-ad76-4c35678113fd。 |
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| 10. | US natural gas imports by country，https://www.eia.gov/dnav/ng/ng_moveJmpc_sl_a.htm。 |
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| 13. | (20150421)。Sanctions will cost Russia more than USD 100 billion，http://money.cnn.com/2015/04/21/news/economy/russia-ukraine-sanctions-price。 |