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COMPARISON OF GAS CHROMATOGRAPHIC AND SPECTROPHOTOMETRIC METHODS OF DETERMINATION FOR CAFFEINE IN COFFEES AND TEAS.STRAHL NR; LEWIS H; FARGEN R et al.1977; J. AGRIC. FOOD CHEM.; U.S.A.; DA. 1977; VOL. 25; NO 2; PP. 233-235; BIBL. 17 REF.Article
