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Elsevier‎(1997)‎

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By Hartl F.   Luyten H.   Nieuwenhuis H. A.   Schoemaker G. C.   in Applied Spectroscopy

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Society for Applied Spectroscopy‎(1994)‎

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By Oudega Ruud   Moons Karel GM   Karel Nieuwenhuis H   van Nierop Fred L   Hoes Arno W   in British Journal of General Practice

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Royal College of General Practitioners‎(2006)‎

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