@misc{indiciae93e2e591ed9b,
  title = {A neighboring optimum feedback control scheme based on estimated time-to-go with application to re-entry flight paths},
  author = {Bryson, A. E., Jr. and Speyer, J. L.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670025607},
  note = {Source identifier: 19670025607}
}