Sieglar, J.; Zipplies, J.; Liese, V.; Siebert, N.; Morck, T.; Theobald, S.; Vajen, K.; Jordan, U. Assessing the Seasonal Potential of Wastewater and Rivers As Heat Sources for District Heating: Methodology and Example Application for the Federal State of Hesse, Germany. IJSEPM 2026, 49, 5-25.