Thermal solar systems and components - Solar collectors - Part 2: Test methods (including corrigendum AC:2002); German version EN 12975-2:2001 + AC:2002— 159 стр.
German construction contract procedures - Part C: General technical specifications for building works - Systems for heating and central water heating— 28 стр.
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Installation of central heating systems and hot water supply systems— 27 стр.
