@article {Zen:October 1999:0039-9140:635,
	author = "Zen J.-M.",
	author = "Yu T.-y.",
	author = "Shih Y.",
	title = "Determination of theophylline in tea and drug formulation using a Nafion(R)/lead-ruthenium oxide pyrochlore chemically modified electrode",
	journal = "Talanta",
	volume = "50",
	year = "October 1999",
	abstract = "",
	pages = "635-640(6)",
	url = "http://www.ingentaconnect.com/content/els/00399140/1999/00000050/00000003/art00160"
	doi = "doi:10.1016/S0039-9140(99)00160-5"
}