@misc{indiciaeb27eabf2a0e2,
  title = {Efficient Construction of Discrete Adjoint Operators on Unstructured Grids Using Complex Variables},
  author = {Nielsen, Eric J. and Kleb, William L.},
  year = {2005},
  url = {https://ntrs.nasa.gov/citations/20050060975},
  note = {Source identifier: 20050060975}
}