Calvera (X-ray source) - Wikipedia
Earth’s neutron-star neighbor - Astronomy Magazine
Calvera Is Earth's Closest Neutron Star - Science 2.0
Calvera: A low-mass strangeon star torqued by debris disk?
Calvera: A Low-mass Strangeon Star Torqued by Debris Disk?
[1106.2140] Is Calvera a Gamma-ray Pulsar? - arXiv.org
Calvera Star Facts (Type, Colour and others) - Universe Guide
Possible Closest Neutron Star to Earth Found
Possible Closest Neutron Star To Earth Found - ScienceDaily
Calvera | Neutron Stars | Ursa Minor Constellation | GO …