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Optimization of coprecipitation using response surface methodology in combination with experimental design for determination of trace Ni by flame atomic absorption spectrometry in biodiesel produced from waste cooking oil. IJCT [Internet]. 2026 Apr. 13 [cited 2026 May 30];33(2):266-72. Available from: https://or.niscpr.res.in/index.php/IJCT/article/view/18010