Zhongming Liang, Corrine Bonneville, Terrin Senez, Todd Henderson. Development and validation of a photometric titration method for the quantitation of sodium chondroitin sulfate (bovine) in Cosequin® DS chewable tablet. Journal of Pharmaceutical and Biomedical Analysis, Volume 28(2), 2002, P. 245-249.
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http://dx.doi.org/10.1016/S0731-7085(01)00563-5