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2. B.E. Birdsall, W.F. Buhl, K.L. Ellington, A.E. Erdem, F.C. Winkelman, Overview of the DOE-2 building energy analysis program, version 2.1D, Lawrence Berkeley Laboratory report LBL-19735, Rev. 1, (1990) Berkeley, CA.
3. ASHRAE/IESNA Standard 90.1: 1999, Energy Standard for Buildings Except Low-Rise Residential Buildings.
4. EN 832: Calculation of energy use for heating—residential buildings.
5. prEN ISO 13790: Thermal performance of buildings—calculation of energy use for space heating.