D.KARUNANITHI, A.RADHAKRISHNA, and V.M.BIJU, “QUANTIFICATION OF N-ACETYLNEURAMINIC ACID( NEU5AC) IN HUMAN MILK USING N- GLYCOLYLNEURAMINIC ACID AS INTERNAL STANDARD BY LC-MS/MS”, ijpbs, vol. 3, no. 4, pp. 299–308, Dec. 2012.