# Quadratic obstructions to small-time local controllability for scalar-input systems

> Research article (Journal of Differential Equations, 2017) · cited 21× · AI/ML

**Wikidata**: [openalex:W2774742483](https://www.wikidata.org/wiki/openalex:W2774742483)  
**Source**: https://4ort.xyz/entity/quadratic-obstructions-to-small-time-local-controllability-for-scalar-input-systems