# It Works—Long-Term Performance Measurement and Optimization of Six Ground Source Heat Pump Systems in Germany

> Research article (Energies, 2019) · cited 24× · AI/ML

**Wikidata**: [openalex:W2991868264](https://www.wikidata.org/wiki/openalex:W2991868264)  
**Source**: https://4ort.xyz/entity/it-workslong-term-performance-measurement-and-optimization-of-six-ground-source-heat-pump-systems-in-germany