@TechReport{RiehmeAIB2007AfT,
  author =       "Jan Riehme, Andrea Walther, J\"org Stiller, Uwe Naumann",
  title =        "Adjoints for Time-Dependent Optimal Control",
  institution =  "RWTH Aachen",
  year =         "2007",
  number =       "AIB-2007-19",
  month =        dec,
  url =          "http://aib.informatik.rwth-aachen.de/2007/2007-19.ps.gz",
}