@misc{indiciae87672809f010,
  title = {Feasibility, parametric design, and comparative analysis of an unguided solid fuel rocket vehicle with solar orbit, earth probe, and re-entry mission capabilities},
  author = {Walker, T. C.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670019696},
  note = {Source identifier: 19670019696}
}