@misc{indiciae3da037cf94ee,
  title = {Generalized gradient algorithm for trajectory optimization},
  author = {Zhao, Yiyuan and Bryson, A. E. and Slattery, R.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910034417},
  note = {Source identifier: 19910034417}
}