@misc{indiciae203786004dc0,
  title = {Concepts for more efficient bulkhead designs for launch and space vehicles.},
  author = {Bernstein, A. I. and Blumrich, J. F.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690034381},
  note = {Source identifier: 19690034381}
}