@misc{indiciae6da8a3ca5ca4,
  title = {Aircraft Turbofan Engine Health Estimation Using Constrained Kalman Filtering},
  author = {Simon, Dan and Simon, Donald L.},
  year = {2003},
  url = {https://ntrs.nasa.gov/citations/20030068293},
  note = {Source identifier: 20030068293}
}