@article{FrieseSM11,
  author = {Sylvia Friese and Helmut Seidl and Sebastian Maneth},
  title = {Earliest {N}ormal {F}orm and {M}inimization for {B}ottom-up {T}ree {T}ransducers},
  journal = {Int. J. Found. Comput. Sci.},
  year = 2011,
  pages = {1607--1623},
  volume = {22},
  number = {7},
  doi = {10.1142/S012905411100891X},
}