@TechReport{Naumann2012DLS,
  author =     "Uwe Naumann and Johannes Lotz",
  title =     "Algorithmic Differentiation of Numerical Methods: Tangent-Linear and Adjoint Direct Solvers for Systems of Linear Equations",
  institution =     "LuFG Inf. 12, RWTH Aachen",
  keywords = "Tangent-Linear Direct Linear Solver, Adjoint Direct Linear Solver",
  year =     "2012",
  number =     "AIB-2012-10",
  month =     jun,
  url =          "http://aib.informatik.rwth-aachen.de/2012/2012-10.ps.gz"
}