# The Rank Upgrading Technique for a Harmonic Restoring Force of Nonlinear Oscillators

> Research article (DOAJ (DOAJ: Directory of Open Access Journals), 2021) · cited 15× · AI/ML

**Wikidata**: [openalex:W3114685237](https://www.wikidata.org/wiki/openalex:W3114685237)  
**Source**: https://4ort.xyz/entity/the-rank-upgrading-technique-for-a-harmonic-restoring-force-of-nonlinear-oscillators