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Sahrawat, K L and Kumar, G R and Rao, J K (2002) Evaluation of triacid and dry ashing procedures for determining potassium, calcium, magnesium, iron, zinc, manganese, and copper in plant materials. Communications in Soil Science and Plant Analysis, 33 (1-2). pp. 95-102.
Sahrawat, K L and Kumar, G R and Murthy, K V S (2002) Sulfuric acid-selenium digestion for multi-element analysis in a single plant digest. Communications in Soil Science and Plant Analysis, 33 (19-20). pp. 3757-3765.