@misc{indiciaec2173a9db62f,
  title = {Concept for a large multipurpose launch vehicle},
  author = {Brunk, J. G. and Gomersall, E. W.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680025115},
  note = {Source identifier: 19680025115}
}