@misc{indiciaefb7fa2bae311,
  title = {Swift X-Ray Upper Limits on Type Ia Supernova Environments},
  author = {Russell, B. R. and Immler, S.},
  year = {2012},
  url = {https://ntrs.nasa.gov/citations/20120015642},
  note = {Source identifier: 20120015642}
}