@misc{indiciae365030b7bd59,
  title = {Investigation for improving Global Positioning System (GPS) orbits using a discrete sequential estimator and stochastic models of selected physical processes},
  author = {Goad, Clyde C. and Chadwell, C. David},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940008609},
  note = {Source identifier: 19940008609}
}