1. Wärmepumpe und Solar;Berner;Solarenergie den Vortritt lassen. Sonne Wind & Wärme,2011
2. Bertram, E., Glembin, J., Scheuren, J. and Zienterra, G., 2009. Soil regeneration by unglazed solar collectors in heat pump systems. In: Proceedings of the ISES Solar World Congress, International Solar Energy Society (ISES), Johannesburg, South Africa.
3. Citherlet, S., Bony, J., Nguyen, B., 2008. SOL-PAC: analyse des performances du couplage d’une pompe chaleur avec une installation solaire thermique pour la rénovation – Rapport final. Haute Ecole d’Ingénierie et de Gestion du Canton de Vaud (HEIG-VD)/Laboratoire d’Energétique Solaire et de Physique de Bâtiment (LESBAT), Yverdon-les-Bains, Switzerland.
4. EN 12975-2, March 2006. Thermal solar systems and components – solar collectors – Part 2: test methods. European Committee for Standardization (CEN), Brussels, Belgium.
5. EN 12977-2, April 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.