1. U.S.EPA. Mixtures of used oil and characterristics hazardous waste; 1993. [accessed at: 〈http://yosemite.epa.gov/osw/rcra.nsf/ea6e50dc6214725285256bf00063269d/b000cb82ff03922f8525670f006bcb84!OpenDocument〉.
2. U.K.DEFRA. A strategy of hazardous waste management in England; 2010 [accessed at 〈http://www.defra.gov.uk〉.
3. Waste management practices: municipal, hazardous, and industrial. Management of used oil;Pichtel,2010
4. P.R.China MEP. The first national pollution census bulletin; 2010.
5. A new model for the used oil location-routing problem;Alumur;Comput Oper Res,2007