# Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands

> Research article (The Astrophysical Journal, 2022) · cited 40× · AI/ML

**Wikidata**: [openalex:W3186080328](https://www.wikidata.org/wiki/openalex:W3186080328)  
**Source**: https://4ort.xyz/entity/four-year-cosmology-large-angular-scale-surveyor-class-observations-on-sky-receiver-performance-at-40-90-150-and-220-ghz