Anisimov et al. (2004),Anisimov, Mikhail A.; Sengers, Jan V.; Levelt Sengers, Johanna M. H.: Near-critical behavior of aqueous systems, chapter 2 in Aqueous Systems at Elevated Temperatures and Pressures, Palmer, Donald A.; Fernández-Prini, Roberto; Harvey, Allan H.; eds., Academic Press, 2004, pages 29-71, ISBN 978-0-125444-61-3, doi: 10.1016/B978-012544461-3/50003-X without referring to Frenkel, Fisher, or Widom, reviewed thermodynamic derivatives (specific heat, expansion coefficient, compressibility) and transport coefficients (viscosity, speed of sound) in supercritical water, and found pronounced extrema as function of pressure up to 100 K above Tc.
