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Zaefarian, F. , Rezvani, M. , Rejali, F. , Ardakani, M.. "Investigation of Phytoextraction Coefficient Different Combination of Heavy Metals in Barley and Alfalfa". World Academy of Science, Engineering and Technology, Open Science Index 69, International Journal of Agricultural and Biosystems Engineering, (2012), 6(9), 690 - 692.