# Analysis on Krasnoselskii’s fixed point theorem of fuzzy variable fractional differential equation for a novel coronavirus (COVID-19) model with singular operator

> Research article (Advances in Complex Systems, 2021) · cited 12× · AI/ML

**Wikidata**: [openalex:W3126932200](https://www.wikidata.org/wiki/openalex:W3126932200)  
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