@Article{         EngelfrietVogler,
  Author        = "Engelfriet, Joost and Vogler, Heiko",
  date-added    = "2013-02-26 13:14:34 +0000",
  date-modified = "2013-02-26 13:16:01 +0000",
  Journal       = "Journal of Computer and System Sciences",
  Keywords      = "tree transducers",
  Number        = "1",
  Pages         = "71--146",
  Title         = "Macro Tree Transducers",
  Volume        = "31",
  Year          = "1985",
  File          = "Macro Tree Transducers - Engelfriet, Vogler (0) (0) - a - a - o.pdf"
}

@Article{ EngelfrietVogler, Author = "Engelfriet, Joost and Vogler, Heiko", date-added = "2013-02-26 13:14:34 +0000", date-modified = "2013-02-26 13:16:01 +0000", Journal = "Journal of Computer and System Sciences", Keywords = "tree transducers", Number = "1", Pages = "71--146", Title = "Macro Tree Transducers", Volume = "31", Year = "1985", File = "Macro Tree Transducers - Engelfriet, Vogler (0) (0) - a - a - o.pdf" }