1. Technique for Rapid Analyses of Corn Leaves for Eleven Elements
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2. Bergman, E. L., Boyle, J. E., Fries, R. E. and Ferretti, P. A. 1974. Influence of virus infection on elemental content of selected vegetable crops. In Proc. 7th Int. Coll. Plant Analysis and Fertilizer Problems. 1974, Hannover, Germany. pp.45–54.