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Analytica Chimica Acta
Volume 232, 1990, Pages 409–412
UV spectrophotometric determination of theobromine and caffeine in cocoa beans
Shufen Li, J. Berger, S. Hartland
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http://www.sciencedirect.com/science/article/pii/S0003267000812635Код: Выделить всё
http://dx.doi.org/10.1016/S0003-2670(00)81263-5