# Two robust tools for inference about causal effects with invalid instruments

> Research article (Biometrics, 2020) · cited 10× · AI/ML

**Wikidata**: [openalex:W3112532512](https://www.wikidata.org/wiki/openalex:W3112532512)  
**Source**: https://4ort.xyz/entity/two-robust-tools-for-inference-about-causal-effects-with-invalid-instruments