# A DDF based model for efficiency evaluation in two-stage DEA

> Research article (Optimization Letters, 2017) · cited 16× · AI/ML

**Wikidata**: [openalex:W2685145578](https://www.wikidata.org/wiki/openalex:W2685145578)  
**Source**: https://4ort.xyz/entity/a-ddf-based-model-for-efficiency-evaluation-in-two-stage-dea