23. HELENE, Paulo & GUIMARÃES, André. Diffusion of Chloride Ions in Unsaturated Concrete: Forecast of Service Life in a Wet-Dry Environment. Chapter 12.  In: Paulo Helene; Enio Figueiredo J. P.; Terence Holland & Rubens Bittencourt (Ed.).  Quality of Concrete Structures and Recent Advances in Concrete Materials and Testing. ACI SP-229. Farmington Hills: American Concrete Institute, 2005. v.1.  p.175-194    ISBN  0-87031-182-4