# Direct digital fractional-order Butterworth filter design using constrained optimization

> Research article (AEU - International Journal of Electronics and Communications, 2020) · cited 20× · AI/ML

**Wikidata**: [openalex:W3094431669](https://www.wikidata.org/wiki/openalex:W3094431669)  
**Source**: https://4ort.xyz/entity/direct-digital-fractional-order-butterworth-filter-design-using-constrained-optimization