Supplementary Backward Equations p(h, s) for the Critical and Supercritical Regions (Region 3), and Equations for the Two-Phase Region and Region Boundaries of the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam. - Kretzschmar, H.-J.; Cooper, J. R.; Gallagher, J. C. (Journal of Engineering for Gas Turbines & Power, 2007)