@misc{indiciaef16cefb02952,
  title = {A trajectory code for maximizing the payload of multistage launch vehicles},
  author = {Spurlock, O. F. and Teren, F.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680022517},
  note = {Source identifier: 19680022517}
}