@misc{indiciae07cefd669ae1,
  title = {On achieving sufficient dual station range accuracy for deep space navigation at zero declination},
  author = {Siegel, H. L. and Christensen, C. S. and Green, D. W. and Winn, F. B.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780047989},
  note = {Source identifier: 19780047989}
}