Нужна статья:
Practical approach for the stability testing of veterinary drugs in solutions and in biological matrices during storage
Siska Croubels, , Siegrid De Baere and Patrick De Backer
Analytica Chimica Acta
Volume 483, Issues 1-2, 25 April 2003, Pages 419-427
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http://dx.doi.org/10.1016/S0003-2670(02)01479-4