1. Goldbrunner, J., Goetzl, G. (2019): Geothermal Energy Use, Country Update for Austria. In: Proceeding: European Geothermal Congress.
2. Goetzl, G. (2022): MUSE – Differences between deep and shallow geothermal energy, accessed on: 15.10.2023, https://geoera.eu/blog/muse-differences-between-deep-and-shallow-geothermal-energy/.
3. Schmid, F. (2008): Sewage water: Interesting heat source for heat pumps and chillers. In Proceedings of the 9th International IEA Heat Pump Conference, Zürich, Switzerland, 20–22 May 2008; pp. 1–12.
4. Arpagaus, C., Betsch, S. (2019): Industrial Heat Pumps, Second Phase. Final report. IEA Heat Pump Technology Programme Annex 48. https://waermepumpe-izw.de/wp-content/uploads/2020/05/Switzerland-2019-1.pdf.
5. Kelz, J. (2023): ThermaFlex – Thermal demand and supply as flexible elements of future sustainable energy systems. Final report. https://www.aee-intec.at/0uploads/dateien1796.pdf