6International Organization for Standardization. ISO 12944-2:1998 Paints and varnishes - Corrosion protection of steel structures by protective paint systems. Part 2: Classification of environment [S]. [s.l.]: ISO, 1999.
7International Organization for Standardization. ISO 12944-5: 2007: Paints and varnishes - Corrosion protection of steel structures by protective paint systems -Part 5: Protective paint systems [S]. [s.l.]: ISO, 2007.