@misc{indiciae3ca6ac34ebb9,
  title = {Minimum-variance reduced-order estimation algorithms from Pontrygin's minimum principle},
  author = {Ebrahimi, Yaghoob S.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900000789},
  note = {Source identifier: 19900000789}
}