1. Task web site: www.iea-shc.org/task44.
2. Hadorn et al., Solar and heat pumps position paper, Internal document of the IEA SHC programme, Nov. 2011, to be released in public domain during 2012.
3. Hadorn J.-C., 2010, Solar and heat pump systems, OTTI Seminar 2010, Bad Stafelstein.
4. Haller M., 2012, The Reference Framework for System Simulations of the IEA SHC Task 44/HPP Annex 38 A final report of subtask C + Reference Buildings Description of the IEA SHC Task 44/HPP Annex 38.