Hans Grasdalen, Ole Einar Bakøy, Bjørn Larsen
Determination of the degree of esterification and the distribution of methylated and free carboxyl groups in pectins by 1H-n.m.r. spectroscopy
Carbohydrate Research, Volume 184, 31 December 1988, Pages 183-191
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http://dx.doi.org/10.1016/0008-6215(88)80016-8
