@misc{indiciae4b589352200d,
  title = {A Phase Shifting and Nulling Interferometer for TPF},
  author = {Velusamy, T. and Beichman, C. and Shao, M. and Yorke, H.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20060032266},
  note = {Source identifier: 20060032266}
}