# SPGD and Newton iteration mixed algorithm used in freeform surface metrology

> Research article (Optics and Lasers in Engineering, 2020) · cited 19× · AI/ML

**Wikidata**: [openalex:W3005491884](https://www.wikidata.org/wiki/openalex:W3005491884)  
**Source**: https://4ort.xyz/entity/spgd-and-newton-iteration-mixed-algorithm-used-in-freeform-surface-metrology