# Estimation of the instantaneous friction coefficients of sliding isolators subjected to bi-directional orbits through a nonlinear state observer

> Research article (Engineering Structures, 2021) · cited 28× · AI/ML

**Wikidata**: [openalex:W3209819113](https://www.wikidata.org/wiki/openalex:W3209819113)  
**Source**: https://4ort.xyz/entity/estimation-of-the-instantaneous-friction-coefficients-of-sliding-isolators-subjected-to-bi-directional-orbits-through-a-