# A hybrid variable selection method based on wavelet transform and mean impact value for calorific value determination of coal using laser-induced breakdown spectroscopy and kernel extreme learning machine

> Research article (Spectrochimica Acta Part B Atomic Spectroscopy, 2019) · cited 75× · AI/ML

**Wikidata**: [openalex:W2918513282](https://www.wikidata.org/wiki/openalex:W2918513282)  
**Source**: https://4ort.xyz/entity/a-hybrid-variable-selection-method-based-on-wavelet-transform-and-mean-impact-value-for-calorific-value-determination-of