By van Staden J. F.   Makhafola M. A.   de Waal D.   in Applied Spectroscopy

ISSN:0003-7028|50|8|991-994

Society for Applied Spectroscopy‎(1996)‎

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By Stefan R.-I.   van Staden J.F.   Aboul-Enein H.Y.   in Pharmaceutica Acta Helvetiae

ISSN:0031-6865|73|6|307-310

Elsevier‎(1999)‎

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