# HFSA: A Semi-Asynchronous Hierarchical Federated Recommendation System in Smart City

> Research article (IEEE Internet of Things Journal, 2023) · cited 16× · AI/ML

**Wikidata**: [openalex:W4380369612](https://www.wikidata.org/wiki/openalex:W4380369612)  
**Source**: https://4ort.xyz/entity/hfsa-a-semi-asynchronous-hierarchical-federated-recommendation-system-in-smart-city