@MASTERSTHESIS{Duff2009MA,
  author  = {Simon Duff},
  title   = {Maintenance Goals in Intelligent Agents},
  school  = {Universität Hamburg, Fachbereich Informatik},
  year    = {2009},
  type    = {Masterarbeit},
  address = {Vogt-Kölln-Str. 30, 22527 Hamburg, Germany},
  month   = {8}
}