2013DIN 105-5:2013 Clay masonry units - Part 5: Lightweight horizontally perforated clay masonry units and lightweight horizontally perforated day masonry panels
2011DIN EN 771-1:2011 Specification for masonry units - Part 1: Clay masonry units; German version EN 771-1:2011
2005DIN EN 771-1:2005 Specifications for bricks – Part 1: Bricks; German version EN 771-1:2003 + A1:2005