@book{JuergensenKariThierrin1999,
  author    = {J{\"u}rgensen, Helmut and Kari, L. and Thierrin, G.},
  title     = {Morphisms preserving densities},
  series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Informatik},
  volume    = {1999, 09},
  journal   = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Informatik},
  publisher = {Univ.},
  address   = {Potsdam},
  issn      = {0946-7580},
  pages     = {21 Bl.},
  year      = {1999},
  language  = {en}
}