+++Journal Chromatography A-ScienceDirect

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нужно 4 статьи, прошу помощи.

Modifications in the chemical derivatization of carboxylic acids for their gas chromatographic analysis
Journal of Chromatography A, Volume 365, 19 September 1986, Pages 171-182
I. Molnár-Perl, M. Pintér-Szakács

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http://dx.doi.org/10.1016/S0021-9673(01)81554-5 

Gas chromatographic analysis of different homologous series of acids esterified in aqueous solutions with butyl and propyl alcohols
Journal of Chromatography A, Volume 446, 27 July 1988, Pages 237-246
I. Molnár-Perl, M. Pintér-Szakács, M. Morvai, V. Fábián-Vonsik

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http://dx.doi.org/10.1016/S0021-9673(00)94438-8  

Chromatographic analysis of polyester-based polyurethane elastomers after alkali fusion
Journal of Chromatography A, Volume 321, 1985, Pages 295-303
R. P. Burford, J. K. Haken, P. A. D. T. Vimalasiri

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http://dx.doi.org/10.1016/S0021-9673(01)90447-9 

Quantitative determination of dicarboxylic acids and polyols in silicone—polyester resins
Journal of Chromatography A, Volume 452, 28 October 1988, Pages 37-42
J. K. Haken, N. Harahap, R. P. Burford

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http://dx.doi.org/10.1016/S0021-9673(01)81434-5 

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