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The official reference for the International Temperature Scale of 1990 (ITS-90) is:
 Procès-Verbaux du Comité International des Poids et Mesures, 78th meeting, 1989, pp. T1-T21 (French version) and pp. T23-T42 (in English).
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The English version of this text was also published in the scientific literature as:
The following two monographs were prepared by Working Groups of the Consultative Committee for Thermometry (CCT). They were published by the BIPM in 1990 and reprinted in 1997.
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Summary
Preston-Thomas H.,
