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© © N. B. In the proof of Proposition 2 we have assumed, for the sake of convenience, that the superselection observables have only discrete spectra. This assumption does not however seem to be necessary and one could carry through the proof by considering direct integral representation7) (instead of direct sum) of the field.doi:10.5169/seals-113483 fatcat:e77kue4spbcbxeknyzto65un4i