He, X., Funfschilling, D., Bodenschatz, E., & Ahlers, G. (2012). Heat transport by turbulent Rayleigh-Bénard convection for Pr ≃ 0.8 and 4 × 1011 ≲ Ra ≲ 2 × 1014: ultimate-state transition for aspect ratio Γ = 1.00. New Journal of Physics, 14, 063030-1-063030-15. doi:10.1088/1367-2630/14/6/063030.