1. Organometallic Modelling of the Hydrodesulfurization and Hydrodenitrogenation Reactions;Sanchez-Delgado,2002
2. U.S. Enviromental protection Agency (http://www.epa.gov/otaq/gasoline.htm).
3. European Union, EU. Directive 98/70/EC, 1998.
4. Hydrodesulfurization of sulfur-containing polyaromatic compounds in light oil
5. R.E. Levy, A.S. Rappas, (Unipure Corporation), S.J. Decanio, P.V. Nero, (Texaco Inc.) World Refining, Anual meeting in March 2001, NPRA. www.unipure.corp.com/wrefine.pdf.