@misc{indiciae75d8f452afb7,
  title = {Retooling the Global Positioning System.},
  author = {Per Enge},
  year = {2004},
  doi = {10.1038/scientificamerican0504-90},
  url = {https://pubmed.ncbi.nlm.nih.gov/15127667/},
  note = {Source identifier: 15127667}
}