@misc{indiciae6423e1dfec7a,
  title = {THz Sources for Space},
  author = {Siegel, Peter H. and Ward, John and Maiwald, Frank and Mehdi, Imran},
  year = {2007},
  url = {https://ntrs.nasa.gov/citations/20070036046},
  note = {Source identifier: 20070036046}
}