# Grey clustering of the variations in the back-to-front airplane boarding method considering COVID-19 flying restrictions

> Research article (Grey Systems Theory and Application, 2021) · cited 18× · AI/ML

**Wikidata**: [openalex:W3134735578](https://www.wikidata.org/wiki/openalex:W3134735578)  
**Source**: https://4ort.xyz/entity/grey-clustering-of-the-variations-in-the-back-to-front-airplane-boarding-method-considering-covid-19-flying-restrictions