# A Two-Stage Boundary-Enhanced Contrastive Learning approach for nested named entity recognition

> Research article (Expert Systems with Applications, 2025) · cited 10× · AI/ML

**Wikidata**: [openalex:W4406901716](https://www.wikidata.org/wiki/openalex:W4406901716)  
**Source**: https://4ort.xyz/entity/a-two-stage-boundary-enhanced-contrastive-learning-approach-for-nested-named-entity-recognition