@misc{indiciaed41d82083385,
  title = {Development of an Interoperable GNSS Space Service Volume},
  author = {Parker, Joel J. and Bauer, Frank H. and Ashman, Benjamin W. and Miller, James J. and Enderle, Werner and Blonski, Daniel},
  year = {2018},
  url = {https://ntrs.nasa.gov/citations/20180006899},
  note = {Source identifier: 20180006899}
}