@misc{Malcher2003,
  author    = {Andreas Malcher},
  title     = {On two-way communication in cellular automata with a fixed number of cells},
  booktitle = {Frankfurter Informatik-Berichte ; Nr. 03,2},
  issn      = {1616-9107},
  institution = {Informatik},
  series    = {Frankfurter Informatik-Berichte},
  number    = {03, 2},
  type      = {workingpaper},
  pages     = {IV, 12 S.},
  year        = {2003},
}