1. Maize International Market Profile, Trade and Markets Division, FAO;Abbassian,2006
2. http://faostat.fao.org (accessed May 2011).
3. http://mrldatabase.com (accessed May 2011).
4. Regulation (EC) N° 396/2005 of the European Parliament and of the Council, European Union, Brussels, http://ec.europa.eu/food/plant/protection/pesticides/index_en.htm.
5. Encyclopedia of Analytical Chemistry, R. A. Meyers Edition;Lehotay,2000