# Coal classification method based on visible-infrared spectroscopy and an improved multilayer extreme learning machine

> Research article (Optics & Laser Technology, 2019) · cited 37× · AI/ML

**Wikidata**: [openalex:W2910476098](https://www.wikidata.org/wiki/openalex:W2910476098)  
**Source**: https://4ort.xyz/entity/coal-classification-method-based-on-visible-infrared-spectroscopy-and-an-improved-multilayer-extreme-learning-machine