@mastersthesis{Zes06,
  author     = {Jory van Zessen},
  title      = {An Optimizer in Stratego for the Helium Core Language},
  school     = {Utrecht University},
  year       = {2006},
  optkey     = {},
  opttype    = {},
  optaddress = {},
  month      = {(In progress)},
  optnote    = {},
  optannote  = {},
}