# Hierarchical online NMF for detecting and tracking topic hierarchies in a text stream

> Research article (Pattern Recognition, 2017) · cited 28× · AI/ML

**Wikidata**: [openalex:W2768066169](https://www.wikidata.org/wiki/openalex:W2768066169)  
**Source**: https://4ort.xyz/entity/hierarchical-online-nmf-for-detecting-and-tracking-topic-hierarchies-in-a-text-stream