Ida Jākobsone, Sanita Zute, Māra Bleidere, Ināra Kantāne and Vadims Bartkevičs
Alexander, P. D., Alloway, B. J., Dourado, A. M. (2006). Genotypic variation in the accumulation of Cd, Cu, Pb and Zn exhibited by six commonly grown vegetables. Environment Pollution, 144 , 736–745.
Ali, Mohamed, H. H., Al-Qahtani, K. M. (2012). Assessment of some heavy metals in vegetables, cereals and fruits in Saudi Arabian markets. Egypt. J. Aquatic Res., 38 , 31–37.
Anonymous (1996). Trace Elements in Human Nutrition and Health . WHO, 343 pp.
Anonymous (1999). AOAC official method 999.11. Determination of lead