Ursa is a spider genus in the family Araneidae. It is the only genus in the tribe Ursini.

Ursa minor:versatile cluster-based storage
Ursa Minor: Versatile Cluster-based Storage.
URSA: ubiquitous and robust access control for mobile ad hoc networks
A New Milky Way Dwarf Galaxy in Ursa Major
The Ursa Major Cluster of Galaxies. V. H I Rotation Curve Shapes and the Tully-Fisher Relations
A V and I CCD Mosaic Survey of the Ursa Minor Dwarf Spheroidal Galaxy
Abundance Patterns in the Draco, Sextans, and Ursa MinorDwarf SpheroidalGalaxies
Calculating galactic space velocities and their uncertainties, with an application to the Ursa Major group
The Star Formation History and the spatial distribution of stellar populations in the Ursa Minor Dwarf Spheroidal Galaxy
Elemental abundance analyses with DAO spectrograms — XVII. The superficially normal early A stars 2 Lyncis, ω Ursa Majoris and Ø ...