# A new class of hard problem instances for the 0–1 knapsack problem

> Research article (European Journal of Operational Research, 2021) · cited 37× · AI/ML

**Wikidata**: [openalex:W4200462156](https://www.wikidata.org/wiki/openalex:W4200462156)  
**Source**: https://4ort.xyz/entity/a-new-class-of-hard-problem-instances-for-the-01-knapsack-problem