Highly sensitive and rapid determination of theophylline, theobromine and caffeine in human plasma and urine by gradient capillary high-performance liquid chromatography-frit-fast atom bombardment mass spectrometry
1995 ◽
Vol 667
(2)
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pp. 241-246
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2000 ◽
Vol 741
(2)
◽
pp. 175-188
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1990 ◽
Vol 533
◽
pp. 275-281
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2006 ◽
Vol 30
(1)
◽
pp. 21-26
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1982 ◽
Vol 232
(2)
◽
pp. 385-393
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1986 ◽
Vol 382
◽
pp. 167-174
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1983 ◽
Vol 272
◽
pp. 205-209
◽
1999 ◽
Vol 734
(1)
◽
pp. 145-153
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