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Qualitative gas chromatographic and gas chromatographic-mass spectrometric screening for β-blockers in urine after solid-phase extraction using Extrelut-1 columnsDELBEKE, F. T; DEBACKERE, M; DESMET, N et al.Journal of chromatography. 1988, Vol 426, Num 1, pp 194-201, issn 0021-9673Article

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