Road and airfield surface characteristics - Test methods - Part 4: Method for measurement of slip/skid resistance of a surface - The pendulum test; German version EN 13036-4:2011— 34 стр.
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Painting and coating work - Coatings— 23 стр.
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Management of road safety measures at road works— 16 стр.