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2. 'The 1967 IFC Formulation for Industrial Use', issued by the International Formulation Committee of the 6th International Conf. on the Properties of Steam, Verein Deutscher Ingenieure, Düsseldorf, 1967.
3. Minutes of the meetings of the Executive Committee of IAPWS in Tokyo 1991, IAPWS Secretariat 1991.
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5. U. Setzmann and W. Wagner, Int. J. Thermophysics 10, 1103 (1989).