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Chakrabarti, N and Roy, S K (1997) Extraction of cadmium(II)-phenanthroline complex on polyurethane foam using dithizone as counter-ion for its spectrophotometric determination in commercial zinc oxides. Journal of the Indian Chemical Society, 74 (6). pp. 474-476. ISSN 0019-4522

Chakrabarti, N and Roy, S K (1989) Selective extraction of titanium as titanium thiocyanate complex on polyurethane foam and its spectrophotometric determination in glass and ceramic materials. Indian Journal Of Chemistry Section A-Inorganic Bio-Inorganic Physical Theoretical & Analytical Chemistry , 28 (12). pp. 1130-1132. ISSN 0376-4710