# RETRACTED: System-Cluster Technology of e-Learning Improvement under the Conditions of COVID-19

> Research article (Sustainability, 2021) · cited 11× · AI/ML

**Wikidata**: [openalex:W4200131283](https://www.wikidata.org/wiki/openalex:W4200131283)  
**Source**: https://4ort.xyz/entity/retracted-system-cluster-technology-of-e-learning-improvement-under-the-conditions-of-covid-19