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3. BSW, 2012. Fahrplan Solarwärme - Strategie und Maßnahmen der Solarwärme-Branche für ein beschleunigtes Marktwachstum bis 2030. BSW Solar, Berlin.
4. CEN, 2012. EN 12977-2:2012 Thermal solar systems and components – Custom built systems – Part 2: Test methods for solar water heaters and combisystems. European Committee for Standardization (CEN), Brussels, Belgium.
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