@inproceedings{BUT4121,
  author="Jan {Chvalina}",
  title="On certain topological state spaces of X-automata",
  booktitle="In: Coll. Math. Soc. J. Bolyai 23. Topology, Budapest",
  year="1978",
  number="1",
  pages="13",
  publisher="Acad. Sci. Hungary",
  address="Budapest"
}