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* [http://www.treccani.it/export/sites/default/Portale/sito/altre_aree/Tecnologia_e_Scienze_applicate/enciclopedia/inglese/inglese_vol_1/pag065-84ing3.pdf Encyclopedia of Hydrocarbons]
* [http://www.treccani.it/export/sites/default/Portale/sito/altre_aree/Tecnologia_e_Scienze_applicate/enciclopedia/inglese/inglese_vol_1/pag065-84ing3.pdf Encyclopedia of Hydrocarbons]
* [http://science.jrank.org/pages/5122/Petroleum-Sources-petroleum.html Science Encyclopedia - petroleum sources]
* [http://science.jrank.org/pages/5122/Petroleum-Sources-petroleum.html Science Encyclopedia - petroleum sources]
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