# Relational nullable types with Boolean unification

> Research article (Proceedings of the ACM on Programming Languages, 2021) · cited 10× · AI/ML

**Wikidata**: [openalex:W3205634919](https://www.wikidata.org/wiki/openalex:W3205634919)  
**Source**: https://4ort.xyz/entity/relational-nullable-types-with-boolean-unification