@misc{indiciae33ccead3dbd4,
  title = {Research on the rotary derivatives},
  author = {Beam, B. H. and Lessing, H. C. and Tinling, B. E.},
  year = {1958},
  url = {https://ntrs.nasa.gov/citations/19710069999},
  note = {Source identifier: 19710069999}
}