Structural determination of alginic acid and the effects of calcium binding as determined by high-field n.m.r.
Cora A. Steginsky, John M. Beale, Heinz G. Floss and Robert M. Mayer
Carbohydrate Research
Volume 225, Issue 1, 17 February 1992, Pages 11-26
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http://dx.doi.org/10.1016/0008-6215(92)80036-Z