@misc{indiciae739136df2f8f,
  title = {Developing a Robust, Interoperable GNSS Space Service Volume (SSV) for the Global Space User Community},
  author = {Bauer, Frank H. and Parker, Joel J. K. and Welch, Bryan and Enderle, Werner},
  year = {2017},
  url = {https://ntrs.nasa.gov/citations/20170001468},
  note = {Source identifier: 20170001468}
}