@misc{indiciaef90ef3230ec1,
  title = {Challenges in Near Navigation},
  author = {Williams, B. and Miller, J. and Antreasian, P. and Helfrich, C. and Owen, W. and Yeomans, D.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20060040914},
  note = {Source identifier: 20060040914}
}