@misc{indiciae78617436dc06,
  title = {Application of trajectory optimization principles to minimize aircraft operating costs},
  author = {Sorensen, J. A. and Morello, S. A. and Erzberger, H.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19810036062},
  note = {Source identifier: 19810036062}
}