A simple, inexpensive thin-layer chromatography method for the analysis of theophylline tablets.

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Flinn, P. E., Juhl, Y. H. & Layloff, T. P. (1989). A simple, inexpensive thin-layer chromatography method for the analysis of theophylline tablets.. Bulletin of the World Health Organization, 67 (5), 555 - 559. World Health Organization. https://iris.who.int/handle/10665/264699