# Experimental approximation of the sound absorption coefficient (∝) for 3D printed reentrant auxetic structures of poly lactic acid reinforced with chicken keratin materials

> Research article (Materials Letters, 2020) · cited 25× · AI/ML

**Wikidata**: [openalex:W3089686549](https://www.wikidata.org/wiki/openalex:W3089686549)  
**Source**: https://4ort.xyz/entity/experimental-approximation-of-the-sound-absorption-coefficient-for-3d-printed-reentrant-auxetic-structures-of-poly-lacti