@phdthesis{Kasprzik2012,
  author      = {Anna Kasprzik},
  title       = {Formal tree languages and their algorithmic learnability},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Trier},
  doi       = {10.25353/ubtr-xxxx-ff17-04fc},
  year        = {2012},
}