# Linking energy efficiency policies toward 4th generation district heating system

> Research article (Energy, 2021) · cited 30× · AI/ML

**Wikidata**: [openalex:W3167447923](https://www.wikidata.org/wiki/openalex:W3167447923)  
**Source**: https://4ort.xyz/entity/linking-energy-efficiency-policies-toward-4th-generation-district-heating-system