@article{Seidl89FiniteB,
  author = {Helmut Seidl},
  title = {On the {F}inite {D}egree of {A}mbiguity of {F}inite {T}ree {A}utomata},
  journal = {Acta Inf.},
  year = 1989,
  pages = {527-542},
  volume = {26},
  number = {6},
}