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3. Complex tripentaerythritol esters as the stationary phase in gas-liquid chromatography;Epimakhov;Zh.Anal.Khim.,1976
4. Analysis of aqueous formaldehyde solutions. Evaluation of new solid supports;Jones;J.Gas.Chrom.,1967
5. Gas-chromatographic determination of small amounts of formaldehyde;Krasirov;Zh.Anal.Khim.,1975