@misc{indiciae07daf13174ff,
  title = {Upper limits for gravitational radiation from supermassive coalescing binaries},
  author = {Anderson, J. D. and Armstrong, J. W. and Lau, E. L.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930051601},
  note = {Source identifier: 19930051601}
}