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  http://scholar.google.de/scholar?q=autor:p-wasserscheid

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  US4482635A - Composition, indicator, process and device for detecting carbon monoxide - Google Patents

  http://www.google.de/patents/US4482635

  There are disclosed an improved CO indicating composition consisting essentially of fumed silica having dispersed thereon dry residues of impregnation with a solution of palladium sulfate, sulfuric acid and ammonium molybdate, a CO indicator…

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