@article {Nielsen_2004_An_Implicit_Exact_Dual_Adjoint_Solution_Method,
	title = {An implicit, exact dual adjoint solution method for turbulent flows on unstructured grids},
	journal = {Computers and Fluids},
	volume = {33},
	year = {2004},
	pages = {1131{\textendash}1155},
	doi = {10.1016/j.compfluid.2003.09.005},
	author = {Nielsen, E J and Lu, J and Park, M A and Darmofal, D L}
}
