@misc{indiciae13c235d5cb8f,
  title = {Foldable beam},
  author = {Hedgepeth, J. M. and Coyner, J. V. and Crawford, R. F.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810016723},
  note = {Source identifier: 19810016723}
}