# Efficient Facial Expression Recognition Algorithm Based on Hierarchical Deep Neural Network Structure

> Research article (IEEE Access, 2019) · cited 301× · AI/ML

**Wikidata**: [openalex:W2931011950](https://www.wikidata.org/wiki/openalex:W2931011950)  
**Source**: https://4ort.xyz/entity/efficient-facial-expression-recognition-algorithm-based-on-hierarchical-deep-neural-network-structure