@misc{indiciae953b753c217e,
  title = {A TRAJECTORY OPTIMIZATION TECHNIQUE BASED UPON THE THEORY OF THE SECOND VARIATION},
  author = {Kelly, H. J. and Kopp, R. E. and Moyer, H. G.},
  year = {1963},
  url = {https://ntrs.nasa.gov/citations/19630010882},
  note = {Source identifier: 19630010882}
}