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Mahapatra, P.K. and Kumar, Ashok and Singh, Mewa and Grewal, N.S. and Pandey, Laxmi and Singla, M.L. (2008) Microcontroller based portable instrument for determination of nickel in edible oils. Journal of Scientific and Industrial Research (JSIR), 67 (2). pp. 132-135. ISSN 0022-4456