# Investigating emerging hydrogen technology topics and comparing national level technological focus: Patent analysis using a structural topic model

> Research article (Applied Energy, 2022) · cited 54× · AI/ML

**Wikidata**: [openalex:W4220850234](https://www.wikidata.org/wiki/openalex:W4220850234)  
**Source**: https://4ort.xyz/entity/investigating-emerging-hydrogen-technology-topics-and-comparing-national-level-technological-focus-patent-analysis-using