1. Y. Horii, H. Onuki, S. Doi, T. Mori, T. Takatori, H. Sato and et al., Desulfurization and denitration of light oil by extraction, U.S. Patent 5,494,572, 1996.
2. W. Gore, Method of desulfurization of hydrocarbons, U.S. Patent 6,160,193, 2000.
3. Desulfurization and denitrogenation process for light oils based on chemical oxidation followed by liquid–liquid extraction;Shiraishi;Ind. Eng. Chem. Res.,2002
4. New design approaches to ultra-clean diesel fuels by deep desulfurization and deep dearomatization;Song;Appl. Catal. B,2003
5. T.F. Yen, H. Mei, S. Lu, Oxidative desulfurization of fossil fuels with ultrasound, U.S. Patent, 6402939, 2002.