Amiri, J. , Entesari, S. , Delavar, K. , Saadatmand, M. , Rafie, N.. "The Effect of Silicon on Cadmium Stress in Echium amoenum". World Academy of Science, Engineering and Technology, Open Science Index 62, International Journal of Agricultural and Biosystems Engineering, (2012), 6(2), 51 - 54.