@misc{indiciaeba3472cf73ea,
  title = {Efficient Construction of Discrete Adjoint Operators on Unstructured Grids by Using Complex Variables},
  author = {Nielsen, Eric J. and Kleb, William L.},
  year = {2005},
  url = {https://ntrs.nasa.gov/citations/20080014855},
  note = {Source identifier: 20080014855}
}