@misc{indiciae6a570cb21f87,
  title = {Improved method of signature extraction},
  author = {Christianson, D. and Gordon, M. and Kistler, R. and Kriegler, F. J. and Lampert, S. and Marshall, R. E. and Mclaughlin, R. and Smith, V.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770000033},
  note = {Source identifier: 19770000033}
}