@misc{indiciae8f13ef53c17f,
  title = {Improved PFB operations: 400-hour turbine test results},
  author = {Rollbuhler, R. J. and Benford, S. M. and Zellars, G. R.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800017927},
  note = {Source identifier: 19800017927}
}