# Discovering Potential Technology Opportunities for Fuel Cell Vehicle Firms: A Multi-Level Patent Portfolio-Based Approach

> Research article (Sustainability, 2019) · cited 24× · AI/ML

**Wikidata**: [openalex:W2986367251](https://www.wikidata.org/wiki/openalex:W2986367251)  
**Source**: https://4ort.xyz/entity/discovering-potential-technology-opportunities-for-fuel-cell-vehicle-firms-a-multi-level-patent-portfolio-based-approach