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- [48] SIMULTANEOUS DETERMINATION BY GC-MS-SIM OF ORTHO-HYDROXYPHENYLACETIC ACID, META-HYDROXYPHENYLACETIC ACID, PARA-HYDROXYPHENYLACETIC ACID, 3-4-DIHYDROXYPHENYLACETIC ACID AND HOMOVANILLIC-ACID IN BIOLOGICAL SAMPLES USING A COMMON SELECTED IO JOURNAL OF CHROMATOGRAPHIC SCIENCE, 1978, 16 (06) : 263 - 267